Poor services from Vodacom

I bought 2 Samsung Tablets TabE on contract on 31/12/15 at Vodacom Eastgate Mall.2 weeks later 1 of the tablets stopped working (completely off) and i took it back to Vodacom.The consultant who took the tablet was Courtney and she told me they will give me feedback within a week of which they did.A week later i received an sms to come and collect the tablet.I got there and Vuyi handed me back the tablet which was still not switching on,Vuyi advised that they will come back to me because the person who worked on it was not available.I called after a week and was told that it was ready for collection, i got there at 18:30 on a Friday just to leave there around 20:30 because no one could assist and tell me where the tablet was.After waiting Zinhle Nkomo came to apologize for taking long to attend to me and she advised that they were going to come back to me with a solution.since then until now Vodacom has been deducting money from my account for something that i am not even using and do not know if i will ever get it back or not. Now the second tablet cannot be used as it's now faulty and i'm scared if i take it back also it will stay there forever.