MTN SERVICE PROVIDER NOT RESPONDING

My husband passed away in September. I visited MTN Colonnade first week in October 2018 in Pretoria with the relevant original documentation so that they can cancel his contract. I received a sms on the 16th of Nov saying the issue was resolved with ref no: 1-***8 When checking my husbands phone it was still active. I phoned on the 16th of November and was told that the issue was with legal department and I should return the handset. My husband did not use a MTN handset, he took a contract without a handset. I sent an email to ********** on the 19th of Nov and by 3 January 2019 nothing was done. I visited MTN Brooklyn 3 Jan 2019 17:06 of which I have all the evidence. There a friendly lady Fazila assisted me and told me that the reference number was completed BUT she can see that the documents are on the system and filed a new complaint. I was told to phone after a week. I have been phoning various times but every time I am told that I should speak to legal department. I hold on for 15+ minutes at a time where after I get cut off. Legal department cannot be phoned which means I am being billed monthly for a contract of a deceased person who is not longer with us. I literally begged them to please cancel the contract with immediate effect and give me the number as a Pay-as-you-go as we have customers phoning my husband which I cannot lose.