BAD service

In July just before the 23 July i app**** for a xboz 4 my son the agent said the contract is R475 and i wll pay Prorate end of August for da few days in July and and August so next debt order shud be mnth end September again no it went off again now im being told dat its 4 the mnth of septemeber now where did anyone tell me i need to pay advance and Plus da instalment is now 485 my sister and friend confirmed dey dnt pay advance I called in da agents said i need to email da agent that did da sale Up until today no reply you guys are so in a rush 4 new applications but when responding to customer complains your office takes 4ever to reply