Telkom -Ilegally debiting bank accounts

March 2018 I excepted a sales call for a sim only Telkom deal and was advised of a 7/10day cooling off period. Within that period I called them received a cancellation form tht I submitted. Ever since then Telkom has been debiting my account and I had not even used their product. To date they are still debiting i.e. last month R2500. They had handed me over to lawyers. Had gone to their walk in store May 2018 and had been in email contact with their employees who is now nt responding anymore. I am stuck between a rock and a hard place as dnt knw how to resovle this issue. Worst Service ever.