Returned Tablet without fixing it

I bought a tablet in January 2015 Huawei Media Pad, April 1st it stopped charging & i took it to the Sandton city store on the April 2, i recieved an sms on the 13th of April stating that they were awaiting quote acceptance, i phoned the store & was told that i needed to fill out an insurance claim form as the pins to the charging system were broken, how was i was to blame as when i took it instore they tried charging it on different ports and obviously when it went to repairs they tried the same so hw could they accuse me? i told them that it was on 1 year warranttee & that it shd be fixed i was told to call customer care, i phoned them and was told they have opened enquiry and they will get back to me in 48 hours i then phoned after 3 days and was told that my query had been closed they opened another one &i kept on calling up until i was told on the 4th of May that it had now been taken to repairs under warranttee on friday i then recieved an email that it was ready for collection, i collected it tried to switch it on and it wld not turn on took it back & was told it was never fixed, they hd it for 5 weeks i have taken it bak in and they still debiting my account yet am not u