Fed up! Reconsidering my future with cellc

I'm so tired of saying the same thing 100 times! I upgraded my phone through the call centre 5 months ago. At that time I only has sweet talks, everything was made so convenient for me didn't have to go out off my way at all but ever since I got the phone I am doing endless running around and many calls to cellc. I just had to buy a new sim 3 weeks ago and spent R150 of my money due to the phone being faulty. Now I do not receive any of my calls it keeps saying \unavailable"I'm losing lots of business due to this. Every time I call in I got the explain the WHOLE story to 100 different agents as I am asked to"