I'm someone else's account with incorrect reference numbers from Cell C sub contractors

So I have a smartdata account at Cell C. I paid my subscription via the Cell C app for quite a long time, up until the payment option wasn't working. Called in several times to get the payments done but always go through to the useless sub contractors that made it a painful experience to even deal with them. In any case, my bill is now due on R877 and today a very rude collections person called me. It was found out that I was paying to in incorrect account number, that was provided by the consultants. They gave me ***, only to find out that it was supposed to be ***. I told her that I will not pay that R300 and odd rand balance until they allocate my two months payments that I made. I will not pay for another persons contract. I made it clear to her that the problem is the sub contractors and she has he nerve to tell me that she's not the complaints department or HR so I musn't speak to her about it. Look at the rotten staff you'll employ CellC !!! Her arrogance me so angry that I ended up telling her to F!@# Off. Even another sub contractor called me to activate a debi check mandate on my bank account with the same incorrect reference number. I'm glad the debi check mandate failed or I would have been paying for some else's accout. The staff you'll hire is going to bring reputational damage to Cell C, or maybe you'll are already there and haven't realized it.