DONT TAKE CONTRACT WITH CELL C

I HAD A CONTRACT WITH CELL C THAT HAS ENDED IN FEBRUARY 2021,IT WAS A MOBILE DEVICE CONTRACT BUT EVER SINCE THAT CONTRACT EXPIRED THEY STILL GO ON AND ON DEBITING MY MONEY AND I HAVE CALLED TELLING THEM TO STOP DOING WHAT THEY ARE DOING AS THE CONTRACT HAS EXPIRED, I HAVE BEEN DISPUTING THEIR DEBIT ORDER EACH AND EVERY MONTH BUT THEY DONT STOP. THEY EVEN UPDATE THIS INFO TO MY CREDIT SCORE SO THAT MY CREDIT SCORE CAN BE BAD KNOWING VERY WELL THAT THEY ARE WRONG. CELL C IS A VERY CRUEL COMPANY I MUST SAY AND THIS IS HAPPENING AFTER I HONOURED OUR CONTRACT FOR THE WHOLE 24 MONTHS. NEVER TAKE A CONTRACT WITH CELL C IF YOU WANT TO KEEP YOUR CREDIT SCORE HEALTHY AS IT WILL AFFECT YOU IN FUTURE