Poor service experience with Cell C no TCF

I have 5 cell phone contracts and 2 internet contracts with Cell C and are very unhappy with my whole service experience so far. My daughter's phone started giving problems within the 1st year of the contract and she took it in to Cell C Tygervalley. After a month they replaced her motherboard and did a swip swop. That still didn't work and she had to hand in her phone by them ***) on 20/06/2015 and received a loan phone from them with commitment that they will deliver her phone once it has been fixed within 1 month. Now no one can trace the phone and they insist we gave in my other daughters phone ***) and that the one we handed in, is now blacklisted by Vodacom and they insist on proof of purchase - while it is a contract phone we received from them. Trying to get assistance from Cell C, but no one wants to take ownership. Spoke to Mandla ***) who is listed as CEO of Randburg and he commited to sort matter out. Nothing happened and when I followed up after 7 days, he could not remember our discussion. Then spoke to Lucky who referred me back to Mandla and they refuse to give me a number for complaints. There is no TCF and I need help please.