Srila Rupa Goswami in his Laghu Bhagbatamritam (in connection with the description of quadruforms) has definitely replied to all these charges and Sripad Shankaracharya the head of the Mayavada school.
"There are in the four corners of the spiritual sky four quadruforms which are well known as 'Mahabastha' of which Vasudeva is the original quadruform and He is meditated upon within the heart (Bhag. 4.3.23) Shri Sankarsan is His plenary portion to fulfil His transcendental desires. Sankarsan is the 2nd quadruform and is the origin of all living beings. He is therefore called the collective living being. His bodily beauty is more fascinating than the combined resplendent beauty of innumerable full moon's rays. He is worshipped also as the principle of ego. He has delegated His power unto Shri Anantadeva and as the Super soul of Smararati(?) Rudra and Satan. It is He who annihilates the existence of cosmos as the Supersoul of Ahi, Antak and other Demons. Third manifestation of that quadruform is Pradyumna. Intelligentia do worship Him in its activities of intellect. The Goddess of fortune is always serving Him by recitation of His transcendental qualities in the region of Ilabati Varsha. His bodily glares are sometimes resplendent like gold and sometimes as bluish monsoon clouds. He is the ingredients for cosmic creation and He delegated His power of generation unto the Cupid. By His direction only all materialistic gods and men, the creator, the Prajapatis, and other living entities do function the regenerating energy. His plenary portion is Aniruddha. Great thinkers and philosophers do worship this form of Aniruddha of the quadruform. His bodily glare resembles like the bluish monsoon cloud. He maintains the existence of cosmic creation as the Super-soul director of Dharma, Manu, Devas. He is always busy in the maintenance of cosmos. In the Moksha dharma vedic scripture, Pradyumna is the superintending deity of the total mind whereas Aniruddha is so of the total egoism. All these statements are confirmed in the Pancharatra Tantras.
So far the pastimeous functions and inconceivable energy of the Supreme Lord is concerned—it is described in the Laghu Bhagwatamrita.
In the Mahabarahapuranam it is said also that all the Forms of the Lord are transcendental eternal and each and everyone of them descend on the earth repeatedly. All such Forms are immune from the perishable material ingredients and therefore none of them are created by the material energy. All them being thus transcendental, they are all spiritual full of bliss and knowledge without any tinge of infective matter.
The same thing is confirmed in the Narada Pancha ratra also it is said that the Lord displays His multi varieties of Personal features exactly in the manner of Vaidurya Gem which reflects different color in different angular vision.
As such somebody may take objection to the above descriptions of the quadruforms. Such critics want to finish the matter at one stroke. But in reply we can say that the Supreme Lord being endowed with inconceivable energy it is quite befitting for Him that He can exhibit Himself simultaneously as one, different, plenaries, and so on as nothing is impossible for Him the omnipotent. So far He manifested Himself simultaneously in numberless forms, it is confirmed by Shri Narada in the 10th Canto of Bhagwatam as follows:—He said—"It is wonderful indeed that Lord Krishna, although He is one without a Second has assumed simultaneously—in sixteen thousand plenaries and has married sixteen thousand queens at once" In the Padmapuranam it is said that the Supreme Lord Hari, although He is transcendental immune and the Primeval Lord, yet He assumes multiforms simultaneously and again lies down in one Form."
In the 10th canto of Bhagwatam it is said "Oh my Lord although you manifest your self in varieties of forms, yet you are one without a Second. As such pure devotees concentrate upon you only and worship you."
And the Kurmapuranam also it is said "The Lord is Personal although impersonal, the Lord is atomic although He is Great, He is blackish although He is colorless and His eyeballs are reddish too."