Altech Cellular unfair data charge

To Whom it may Concern,<br> <br> I bought a laptop on contract from Altech cellular in April this year. In total, with insurance, my monthly installments were worked out to R320.00 per month which is deducted via debit order from my personal bank account.<br> <br> At the beginning of this month, I noticed that Altech cellular deducted R2227.91 from my account. <br> <br> Upon further investigation, I was informed by a store consultant that as I have an \open line