Samsung Service

I bought a phone on contract is December from Telkom store, a samsung brand. It was all fine till the first week of January it had a small green dot on the screen, took it to Telkom SA in Centurion Mall they told me they will have to book it for 21 days, mind you I need this phone to arrange my day and meetings, they told me to take it to Samsung store in Menlyn. Now its been a month since they took the phone but Telkom still dept their amount on a device that I am not using, because it was factory fault. Now they telling they dont have parts to fix my phone.