Telkom billing extra R200 every month.

I have 2 contracts with Telkom mobile 1st opened 30 June 2017 free me 1 GB p8 lite which i receive 10 GB special and the other one opened April 2018 free me 1GB 100 minute special. in May 2018 i phoned telkon asking them if it is possible to switch my benefits between the 2 numbers thats when my problem started. I am billed obligation fee of about R200 combined since July as if I upgraded before time .In December I stopped paying for 1 contract hoping they will call and fix something but still nothing is been done. I have logged calls with them no one bothered to respond, even went to their branch they will tell me they do not assist with billing and will log calls for me. Thursday the 7th Feb I went back to the branch and they logged a call for me as usual and the billing team called immediately. the guy who was assisting me told me that the billing was correct according to record both my contracts are 8 months old a( so I had 2 upgrades with P8 Lite and P9 Lite question is will I upgrade with the same phones as I I currently have). I said I can email the proof of my contracts and I was told unfortunately it will not change anything. So someone took phones inside Telkom, loaded them in my account so my contracts are extended and I am also paying extra amount every month for someone else to benefit.