For quick resolution, you can visit the partner app / website for raising a request for loan closure at partner's end.
Alternatively, if you approach the bank, you can do the following, post clearing all your pending dues -
Please visit the partner platform if your pay later account is not working or is unavailable to you currently.
Please follow the below steps for validating the Digital Signature on the sanction letter/agreement copy PDF.
1 : Right click on sign go to Show Signature Properties
2 : Click on Show Signer's Certificate
3 : Go to Trust click Add to Trusted Certificates
4 : Then tick the all box
5 : Click on OK
6 : Click Validate Signature
7 : Close