Pathetic poor service

I am so tired of pathetic service from network providers. I upgraded my contract on 19 July 2019. I did not get a new sim card or a new device. I asked the agent numerous times are you 100% sure that the upgrade on this contract is for R199 per month and he confirmed it every time. When I received my first statement after the upgrade it was incorrect I phoned 135 and they informed me it was the pro rata. And now my statement amount is still incorrect. Now I have to send them my contract or agreement which I never received. I asked MTN numerous times to LISTEN to the recordings on 19 July 2019 that I specifically asked for the contract of R199/month NOT R299/month. But apparently MTN employees are either incompent or too lazy to listen to recordings. I wonder why are phone calls then recorded. I am not going to pay R299/month.