terrible service

I bought a Gobii phone from Kalahari at round about May 2014. Two months after having the phone I noticed the battery giving problems and it would just die alot. After charging one day I noticed the back cover was a bit open and chipped and then realised the battery was swollen. I immediately switched everything off and took the battery out and put everything back in the box. I contacted kalahari and they said they will contact me wyen they have batteries in stock. I waited until Feb 2015 and still ni contact and now they say they dont stock it anymore somthey would have to give me a refund because of the one year guarentee. They collected and confirmed they recieved the phone back on the 6/01/2015 and will take 14 working days to sort everything out. I have been calling and emailing and no one can help me or knows whats happening. I get promised by each agent that they'll find out and get back to me but no one does. I spoke to Madelaine today and still no luck. I will never do business with them ever again and strongly advise that no one else does either. Ive been a customer for ten years now and very unhappy with their service and this is not the first time either.