There is no need to get your transcript attested from PTU. Instead, you just need to request for the original transcript. It is a single page containing all the marks. Moreover, there is no need to get an NOC from your college to request a transcript.
Do not go for attestation, simply request for the original transcript. You can also apply for it online by signing up on the portal of PTU, uploading all necessary documents, and paying the respective charges.
I have a few friends from PTU and according to them, you will have to visit PTU in person to get the transcripts.
There is no requirement for attestation of transcripts. Place an order for single-page transcripts revealing your grades. The transcript fee is INR 300.