Dear OP, believe me that users of this platform are technically more conversant with transactions done through the Blockchain than the banks.
We probably have more Blockchain analysts than the bankers who were supposed to give better details of your situation but if I may ask, how long have you been waiting for this transaction to reflect? I consulted my banker friend and she said it may take maximum of 5 working days for the transaction to be successful.
You should diligently crosscheck the bank details given to the sender and if all are correct then you should contact your bank and also ask the sender to do same with his bank.
If it is not network issues, it might either be incorrect bank details or the sender is somehow playing games with you.
I have done some trade that bitcoin wasn’t an available option but I seriously insisted on it.
Bitcoin is optional for payment in the outside world and you can not succeed at all costs that everyone dealing on transactions with you must pay with Bitcoin.
OP also made it clear that Bitcoin was not part of the payment option, so he can not insist.
