Cell C misleading sales and now......

2016 Cell C sold a router to my husband, 10G data for R299 p/m. On the first day we where unable to connect, we phoned Cell C cust care, just to find out the data is only 3G and not 10G. While we where in the process to get this sorted (Cell C wanted to get the call recordings) 1st amount debited from his acc for R599. Once again we phoned and was told we where 'out of bundle' (even though we could not connect). This led to a huge argument and Cell C admitted to their sales mistake, came to fetch the router and cancel the contract...... No contact was made by Cell C to us in any regard, we had the impression all was over and sorted. 3 years later, we app**** for home loan and found that cell c handed us over, a judgment on my husband's name.... Amount of R4600? I once again phoned cell c 3 weeks ago, eventually after an hour got a Ref nr, and was told that this was a mistake and it will be corrected/refunded, I will receive a letter from Cell C stating my husband's name will be cleared from ITC. When we phone to follow up we get transfered all over just to be told we have to wait for someone to call us? A lady called Monday 18/11 and promised te get back to us within the week.... A week and 2 days later nobody gets back. This was the hustle 3 years ago, nobody got back to us (and our contact details have not changed) and now nobody helps. Cell C is ruining our lives for their mistake. I have no other resort and hope this complaint will help us. Please, we need a letter to continue with our home loan application stating ITC/judgement for my husband will be removed!!!