Cant make or receive calls on my Cellphone

I bought my phone on December 2014 December at the Telkom mobile store in JHB cbd (Marshalltown), on September the phone started giving problems, I could not make or receive call and also could not receive SMS's. On the 16th of September 2015 I took to my the Telkom mobile store for repairs and I was told the turn around time is 30 days, after the turn around time I went to the store to fetch my phone and was told that my is not yet fixed.<br> <br> On the 1st week of December I went back to the store to fetch my phone and I was told my phone is not yet fixed...I then requested my phone so I could get it fixed myself as I was told by one stuff members at the store that there is nothing Telkom mobile can do about it because the supplier/company that is suppose to fix my is saying that my phone is out of warranty even though I have supporting documents to proof that the phone is still in warranty.