FamPay Phone Number Already Linked to Bank Error

I am a FamPay user and would like to update the mobile number registered to my account, but I am unable to do so due to a technical error in the app. For the past three days, whenever I enter my new mobile number into the FamPay app and submit it, the error message “Phone number already link to bank” pops up immediately, preventing the process from moving forward. This issue appears right after I input the new number and hit submit, leaving me unable to update my contact details and causing difficulty in properly using my account. Since I have not received a clear solution so far, I request FamPay to correctly link my new mobile number by removing the old one from my account, or provide another appropriate resolution so that I can use my account without any hassle.