What a waste of customer service

I received an SMS from Cell C stating that my tariffs will change. I have mailed them numerous times over the past month requesting more info. I have yet to hear back from them. I also would like to cancel one of my contracts, I tried calling Cell C customer care, I must have spent about 20 min on hold, then when I finally did get hold of someone, they would put me through to a different department and then cut my call. On the final call to them I was so annoyed, they asked me to answer a few security questions to prove that I am who I am. I then proceeded to answer all the questions, way more than usual, then was told that I failed to answer the security question correctly. I know this is incorrect as I was there when I answered the questions and I am who I am else I would not be calling them or writing this complaint. The lady was blatant about it and could not tell me (prove) that I had answered anything incorrectly. These aren’t the first issues I have has with Cell C. the service I have received this far is totally absurd. Will definitely be looking at changing networks when my contract expires.