MTN mobile - terrible service and support!!!

After my Fathers Passing in April Last year, I have endeavoured to ensure that all of his business and account were in order. I contact MTN in May 2020 and informed them of my fathers death and requested to transfer the contract to a pay as you go contract in my own name (the named executor of his estate). It was indeed confirmed that this would take place once the outstanding amount for the contract was paid and this would happen effective end Nov 2020.......Since then, I have not had any response, many phone call attempts and emails have been left unanswered and even going to a shop in person has not helped......we need this cell phone number until we have finalised the transfer of all of my fathers assets and liabilities to the respective persons and organisations.....this just makes this very difficult time, more and more difficult needlessly!!! I have dealt with Zanele Mapoma and Elroy Maistry by email - but the communications have just stopped!!!