Over charged.

I have a contract with telkom which was activated in January this year and as per the consultant that assisted me, the first debit was going to be in February month end (double payment) I was okay with that but in March n April the debited amount was R800+ which very disturbing because I was advised that as of March the amount will R300+. I cannot afford to have this amount of money debited from my account without any valid reason. I am would really appreciate to be assisted and get my over charged amount back. My contact number: *** Email address : ***