I sent my transcripts from the campus PO to WES. They rejected it initially and I asked them to either accept it or cancel my application and they accepted it. Evaluation is due for completion on April 10th. Btw, this is not an ECA for IRCC. But I guess they will accept the document if you send it from the University PO without tampering with cover, just as you receive it. I did the same for my sister's ECA for immigration, they are still reviewing her documents for the last few weeks. So, can't say for sure how that will go until WES confirm they accepted it. They are taking too long to process these days. My friends' status changed to "in progress: we are reviewing your documents" from "on hold", I guess that means they decided to proceed with their documents too.
In any case, sending it from the campus PO is the best option you have until uni starts their own courier service (choose speed post as it is faster than registered and easy to track.)
Yes, in WES application you have to enter institution as Anna University even though you studied in an affiliated college.