COMPLAINT

So I installed WIFI last year April via Cell C, had it for 7 days and a accident cutt off my line, I reported they send people to check the problem and never came back to me. I continued to follow up with Cell C and no help was given at all, today my complaint is still open and I am being send letters of demand for a bill of R5 000.00. That time I never used the Service, I called and cancelled or requested that it be placed on hold but nothing has been done I am still being billed. My line is still cut and I only had WIFI for 7 days, they cannot make a decision regarding this or not sure if my complaint is so stupid that they cannot help me, that time my ITC record is being affected as I get calls from debt collectors and this outstanding amount is recorded on my ITC. I DO NOT KNOW WHAT TO DO SO THAT CELL C CAN ASSIST ME!!! IT HAS BEEN MORE THEN A YEAR AND STILL NO ASSISTANCE!!!! The last call center manager that called me had an attitude and said it's a curtsey call a year later regarding a complaint. Help me make sense of this please.