We only have the information that you provide to work with. In your original post, all that was included was "proof or purchase", which actually means nothing in removing an Activation Lock if not from Apple or Authorized Apple Seller. That is seen here every day here on this support site when the Activation Lock is not removed.
It still seems like there may be some missing information as a Carrier Locked device is not one of the conditions where Apple refuses to remove the Activation Lock. The conditions outlined in the Support Article are:
- Receipt must show serial number or IMEI number with you being the owner.
- Device must not be in Lost Mode
- Device must not be managed by an employer or school.
https://al-support.apple.com/#/additional-support
Sorry you feel my previous response was rude and unnecessary as truly that was not my intention. I do think it is good news that Apple is still asking you to send the request, because in cases where it is denied, you would be notified that no further requests would be considered. You will need to continue to work with Apple on this and it does take time. I wish you the best of luck that it will be resolved soon.