Unsatisfactory repair issue

I bought a phone at ackermans at centurion mall a month ago (October) and a month later it started giving me problems. Took it to ackermans for repairs and I was told to take it to vodashop myself. It was taken and booked for repairs and now vodacom is quoting me over R2000 for repairs with the fault being at the charging point. What surprises me is how am I expected to make payment when my phone is still under warranty of 12 months?