Customer service disaster

I am so unhappy with Telekom service currently. Telekom doesn't value their clients and they take advantage of their clients . I had several queries with them this year which they failed to give direct answers. I am on 10gb +10free day and the same for night totaling to 40 gbs a month. I started streaming midOctober and I ran out of bundle and that's where I started to enquire how many bundle do I get credited with monthly. I went to the store which couldn't help they logged a query and technical department called. My request was based on the app balance I saw which totalled to 30gbs that I noted. The previous months my usage was under and that's why this checking was not important. So I wanted to find out about my credit, spend and carry over. From the App my previous monthly spend was under and I wanted to find out what happened to those carry overs, like my Sep one.They couldn't explain what they showed me at the store, they even logged a technical query and send an itimised billing which showed usage for the month but couldn't show the carry overs and from 4 months backward my usage was relatively low, so I asked about previous month carry over on Oct, they couldn't explain it. Second query I subscribed to show max in Oct and I noticed on my Nov invoice I was charged with double subscription for Oct & Nov on Showmax and I called they couldn't give an explanation they said they will investigate in the mean time they can't do anything. I received an sms that said my issue was resolved without knowing how. I called them again and they said the subscription was removed and I asked them to remove the cost for Oct and Nov as I didn't do dual subscription. They confirmed invoice corrected, come the debit order date the initial incorrect invoice was debited again. Which cost me time to log another query with them unfortunately I missed the call that day, sadly they don't email or sms only a call and they closed the query. What I want now is to unsubscribe to showmax and 2020 my contract is expering I won't renew it, they won't miss me as I am not valued as a client. I won't renew my contract with them. What I want them to do is to unsubscribe me on show max. Their resolution process is unfriendly and doesn't keep the client on the loop. They don't articulate things clearly and the Telekom app is the worst it gives inaccurate balance. I wouldn't advise anyone to take up any contracts with them.