Incorect Billing

I have been incorrectly billed by MTN ( QUERY: Request REQ:***)<br> <br> Total MAXIMUM cost per month is R1,299 ( Including VAT). Everyone agrees about this. It's what my contract says and it's what both Lindley Larry ( Waterfront Sales consultant) and Theo Nxantsiya ( Sales consultant who sold the contract to me) have confirmed to me in the store. <br> <br> 1.) My bill for July should have been ( per our discussion) 11 days in July and 13 days in August ( payment run is on the 13th per MTN consultants) = 24/31 days x R1,299 = R1,005.67 ( Contract initiated on 20 July 2015)<br> <br> 2.) My bill for August should be: R 1,299. ( Per contract)<br> <br> 3.) Total: THUS is R1,005.67+ 1,299 = R2,304.67<br> <br> My deduction per my bank statement was R2,538. SO MTN owes me R233.33. Can you please arrange for MTN to deduct this from my September invoice? Otherwise MTN must prove that I owe that amount. But this is unacceptable.