MTN"s Shocking Service

So tired of dealing with MTN. Have been trying to sort out the account of my husband who passed away 18 months ago. I asked to cancel his main contract and make this pay as you go. Was advised that I had to wait for the contract to expire in a year - Jan 2021 - which I did and after another phone call it was taken off contract. THere were two other numbers that we had never used (one of those offers of new phones but not part of the contract). Anyway these kept on being billed as Flexi110. I again contacted MTN and they advised that these would be cancelled as at 7th July. Today the 29th July, I received an invoice (which I should not have), showing that the two additional numbers have no amounts/costs, however they have charged me for Event Content. Impossible to get resolved. Today I called again and was told I had to go to one of the stores!!!!! Can't they get their story right across all areas!???