Extremely bad service in a difficult time

My husband passed away 3 Sept 2018. He was paying for my son's MTN account. As soon as the executors of the estate informed MTN, and send through change of banking to my name early in Oct the phone was cut off and claim was put in against the estate. How can MTN simply cut the phone, put a claim for no service??? After visiting a MTN shop, with no help, extremely bad service, I contacted MTN legal and was told they cant help me, the account is in my husbands name and they must speak to him! Really!!! I finally could get details to be able to pay and installment. POP was send through to Tshepiso Moletsane end OCT and numerous emails from my executors and myself recently. When you call the MTN you get put on hold forever! The phone service has disconnected for 3 months now! Dont know why I paid an installment for no service at all! I simply need the MTN account to be transferred to my name and deducted from my account as per all details and attachments send through, and at least a statement to show how much is outstanding and what Iam paying for............but no response from MTN!