vodacom refuses to fix lenovo tablet

I upgraded via the call centre few months ago. I asked for the special which was a vodafone smart tab 3. Anyway it gets delivered to me and 2 months later it doesnt want to switch on. So i take it to voadcom customer care since its under 2 year gaurantee . The they show me that at the back it says lenovo and even thou i bought it from vodacom they refuse to fix it.they say i must take it ro lenovo.so after months i finally get the number which is part serve to fix it on behalf of lenovo. So they booked it in and a month later tell me they dont have the parts.they will supply me with an invoice and i must go back to voadcom where i purchased it from and get it replaced. I went to the customer care and they say i must phone the the upgradr centre and they must replace it. Now im running around for months without a tablet and vodacom refuses to help me. Bur i purchased it from them.it doesnt make sense to go to there suppliers and find out what to do.ontop of that i asked to upgrade to a smart tab NOT a lenovo. Vodacom is bad assistance and breach of contract. They need to replace me or cancel this contract free of charge, as i am now paying for a tablet that i dont even have!!!!