Very poor service

In July 2020 I released my monthly account was R4500 more than usual I call Vodcom in August when checking my account, was told that they has Been Data and Airtime been bought on 1 off my other numbers I told the lady I was speaking to that it was a number that my late son used and hasn't been used since he past away I asked how is it possible my i was told that my debit order for end August will be over R19000. I told the lady that not correct I never used the card in years she told me I'm liable for the amount I ask her if I can make arrangements to pay it off over 6 months yes but your account will be put on hold for that period R3260 was debited 02 Sep 02 October and 02 November .I received a message around middle November to say default in payment I once again called to find out whats going on I was told I never paid in September, I said impossible I will check my statement to find that the debit did go off on the 2 September on calling back I was told October debit didn't go off I went into the branch to see if I could sort the problem out and was told I owe R24000 many of calls to Vodcom on Thursday 3 December I gentleman I spoke to told that its services that I need to pay I must wait until Friday or Monday to make arrangements to sort my account out, I must of tried 10 time once I got through i was told I owe over R29000 and must pay it over 2 months I asked the lady I can't afford it its not that I don't want to pay can I pay it off over 6 or months answer was No 2 months i asked for the Manager I was told I emailed the Team leader and he will call you its 17h46 still no call like many others been told I will call you back Please I need assistance