Telkom shoddy assistance and help.

After having a Telkommobi for my elderly Mother,who was put in a frail Cair,I went to the Herm**** Telkom Office at Whale Coast Mall to cancel the contract,and was told by the gentleman on the 3rd August 2019 that it was cancelled,and only 1 instalment will go off still the end of the month,and that was the last amount,have received numerous calls messages etc,explaining this,I then found out that I had been black listed for this account,for which I was told would be paid up the end of August,to stop this I paid the amount in full and went to the telkom office,and waited in line of people outside,due to covid,to be told I must phone,one cannot get through to the lines,but have paid this account in full,which should not of been,no payments in all the time where ever missed,and feel this is just to terrible,to black list my name..I ask that the listing against me please be removed as this was not a fault of mine,but the person who attended to me when went in to cancel subscription,and at no time was told a penalty...just 1 more instalment would come off my banking account.There are cameras in the Telkom Office,so they can check that date I was there,and also check the amount paid which I should not of..is in full.This has caused my credit rating to be blacklisted and need some advise or assistance please