POOR SERVICE DELIVERY

My mother passed away. She had a contract with mnt with 5 numbers on. All 5 numbers are due for an upgrade. We've been struggling to transfer the account over to my fathers name. Note that all this numbers is used for daily business. Every day when he goes to mnt no answer. In june we were told to transfer the numbers over to his name with his bank account. They told us alter 3 months we will be able to upgrade the waiting time is 3 months to transfer the account. After 3 months no progress.