Trying to Resolve Issues...Waste of Time!

I have been with Vodacom for around 15 years and have never had much issue with their service until about 2 years ago. I had a contract with Vodacom which I never defaulted on, then about two years ago I started being charged for excessive data usage etc, which I was sure was wrong. Hence I stopped paying...long story short I ended up with an arrears amount of R14k. I eventually conceded to paying it off which I finally did in December 2019. I requested that my lines (there were 3, 1 phone and 2 data) be moved over onto prepaid. This was done with my phone line but not the other two. I am now sitting with an arrears amount of R2k which I am refusing to pay as I requested that the contract for the two data lines not be reinstated. I have already made 3 looooong phone calls to Vodacom but am no closer to having this issue sorted. They are quick to phone you when things are wrong on your side but when corrections need to be made to their side, the process is tedious and in most cases very unhelpful. They mess with people's lives in a big way all in an effort to make more money, my credit score has been terrible for two years, now just when I thought I can get it better....these people just come and mess things up.