unhappy first time samsung and vodacom user

I received a samsung galaxy trend neo as a gift. That i booked in for repairs in April due to unclear reception during a call . The caller would not clearly hear me while i could hear them or vice versa. When i received it back in May the problem was not fixed and noticed that the right hand side, by the screen was left open and had additional dents which were not initially there when booked in. I sent it back the following day and after a week when i was texted to collect it (today), i realised that it wasn't fixed let alone touched as it still had the same exposed right hand side. When i pointed the visible, open, right hand side to the consultant he took it to the back to get it closed. When i told him how doubtful i was about their service and asked for a way forward should my problem persist he just shrugged his shoulders and told me its up to me how i sort it out. I am home and for the past hour i have been on a very unpleasant call as my initial reception problem wasn't fixed. I'm sceptic about going back to Vodacom and about Samsung as the phone was brand new when i received it. I had my eyey on new samsung products but if this is the experience they leave you with. No tha