Edgars worst service

Hi

First of all I didnt ask for airtime subscription, battled to cancel airtime subscription for 3 to 5 Months when that was cancelled the money that was charged to me has been credited on account but the interest and late payment amount that was charged to me hasn't been credited to me,The lady i spoke on call center told me its my fault i didnt pay on time.On my statement edgars has a note telling me I have been reported to credit bureau for slow payment.Is there any suggestions to get this problem sorted out.Is there any lawyer i can get him involved or I can take them up to consumer protection laws where I can Sue them .For there mistake they are reporting me to credit bureau.