cellphone fault

I bought a phone at John Craig. And it started giving me problems as it has a faulty charging system. And it's still under warranty. I was told that the hisense u970 was discontinued and they don't have spare parts. I've been given a run around for more than a month now. I even sent an email to the hisense company and its pillar to post. I'm unemployed and I bought that phone for convenience so I could job hunt with it. Until today no one is saying anything