Poor service

I would like to lay a complain against MTN, I bought a phone there & they offered an insurance. Now I lost that phone in December and they told me I need to pay an excess fee of R300 on the 12 of January after I have sent all the papers with a stamped affidavit. I have been calling them each & everyday, all these times I've been told my phone is on the way by their insurance & I should wait for their courier, it's been almost 2 months now & I'm getting frustrated because every time I call them they're sending me aroung or they'll just put the phone down while being put on hold for long. Please help me Hello Peter I can't deal with MTN anymore. Thank you