I-phone battery replacement only laste two months

I had my battery replaced in May at the i-store in Somerset West. Two months later it was just as bad as before I had it replaced. I went back to the store only for them to tell me they did not have a technician on site to look at my phone, I should come back the next week. The next week I was told that it would cost me R250 for them to look at the new battery that I paid R700 for and I would be without a phone for a week. I requested to speak to the manager and was told that the tech should be there next month. I went back again a few weeks later and was then told to go to Tygervalley i-store. After some trouble I managed to get to Tygervalley today for them to only tell me that they can also not help me...Century City does the repairs...o, and my 3 months guarantee has expired... Do not bother having your battery replaced for an i-phone. Most useless way I have ever spent R700.