Here is another very glancing source
"On the contrary, evidence is not wanting to the point that bitter quarrels were going on between the followers of Hīnayāna and Mahāyāna. We learn from the biography of Hsüan-tsang that a South Indian brāhmaṇa
, an old scholar of the Hinayana, Prajñāgupta by name, had composed a treatise in 700 verses
"against the Great Vehicle", and that Hsüan-tsang had to compose a similar polemical work in 1,600 verses in order to refute the same. The book written by Hsüan-tsang was entitled "the destruction of heresy." Thus the Saṃmitīya sect, to which Prajñāgupta belonged, was treated as heretical." Joshi, Lalmai. Studies in the Buddhistic Culture of India
. 1987. p. 171
Hard to even imagine what a Pudgalavādin criticism of Madhyamaka would look like. I can't imagine the text survived, but I wouldn't be surprised if Hsüan-tsang's response did - perhaps it could be reconstructed from that.