Telkom, unauthorized debit

My name is Cyril Thokozani Kweyama,I've got this problem from the Telkom contract,my contract upgrade was due from November 2019 then I only did the upgrade on the end of January 2020.The agreement of the new contract upgrade was R305 monthly,then for the for 3 month's they were deducting wrong debit order of R399 monthly,then Celldirect was informed that they are deducting wrong installment then they refund me R282 at the end of April 2020.Then on the 3 of May 2020 I received a statement from Telkom stating that the debit order for May 2020 will be R6,789(Device obligation).On the 05.05.2020 I logged a call to Telkom case number ***8.As from now no one respond about this R6,789 (Device obligation) and it have been deducted from my account on the 26.05.2020. Please return this money, I'm struggling at home due to Covid 19, how I'm I going to buy food for my family,