Vodacom not honoring their warranty

I took my phone for repairs as it didn't want to charge. Phone worked if u angled charger in a certain way. Phone is still under warranty till may. Then I get updates continously about what's happening but when phone gets returned to shop not fixed I got nothing. That's just pathetic. They then tell me it's beyond economical repair when I called. My thing is they just didn't want to fix the phone as its warranty is almost done. If they couldn't fix it, shouldn't I have received a replacement phone, as I'm now siting without a phone. I have upgrades due soon but I'm done with vodacom, as to me they didn't even try to fix the phone and also why all of a sudden when I try and wiggle the charger now the phone can't even charge at all. Vodacom is *******. Last month also they overcharge me on my bill an didn't had to call to fix it and was also not Called back once it was resolved. I had to call them again . I want an explanation why I couldn't get a new phone or why they really couldn't fix my phone. Cause if I get my phone fixed somewhere else and it dowsnr cost me an arm and a leg. I will be taking this further.