BILLING ME ON WRONG ACCOUNT THAT I PAY !!! THENY E

SO I PAY MY ELECTRICITY BILL RELIGIOUSLY ANS THEN I BUY PREPAID ELECTRICITY NEXT THING IM TOLD I CANT BUY BECAUSE I OWE 11k . I GO THERE AND THEYRE JUST LIKE OH YOU HAVE BEEN PAYING INTO THE WRONG ACCOUNT AND IM LIKE WHOSE FAULT IS THAT? Now I must make arrangements for God knows what!!! Please help me. Tshwane is taking advantage of me.