Disappointing service from Vodacom Customer Care

I have been stuggling since Aug 2018 to cancell a contract with vodacom. It was a contract that my father took out for my mother ,but she passed away in Aug 2018 and we went into the Kimberley vodashop to cancell this account . A month after I followed up with the lady . She told me that my father must come in to sign the final cancellation documentation. I asked her to make sure every single account on his name must be cancelled. She phoned me back after my father signed the documentation and assured me that this has been done. For 7 months we did not received as much as a statement from them .. Until the the "Bad Dept" contacted him to tel my father ...He will be handed over if he does not pay. I took it up with Vodashop Kimberley ...who told me that they cannot find any documentation to cancel this account and that the lady who assisted my father does not work there anymore . Nobody seemed very interested to help me. I contated vodacom customer care and for a week now I have trying to get a respone from them and get hold of someone who rep**** on my email... This is a loosing battle .. They do not care about this query and so the amount keep building up on my father's name . This is so pathetic from Vodacom... ********** **********