urgent request

good day. I received my statement on the 25/03/2016 and the amount was R112.89, however i paid an amount of R115. Yesterday i received a quote from you that i need to pay R123.what i don't understand is why you will add service fee on the amount if the service fee has already been added when i received my statement. how can i be billed twice for service fees. why the statement will say the amount is R112.89 but then you send me an amount of R123. i will make sure that i never take anything from you again. can you please just give me the amount still outstanding in order to settle this account and close it immediately. i send an email yesterday, but no one got back to me. as soon as my account is piad in full, please close me account asap.