wrongfully debited

i was advised in store that there is lte coverage in my area according to your coverage map. i then proceeded to taking out a 10gb lte contract only to discover when i got home, there was no lte coverage. it didnt even pick up 3g. i made contact with your store and returned the goods the next day and was advised that everything would be cancelled. this was around the 23/10/2015. from then till now, i received two statements and two cases were logged regarding the cancellation. i was told to ignore the statements. today i was debited R903.97. please refund my money and ensure that this contract is cancelled