Cell C stinks

Our 2 business contracts were bought by Cell C from Vodacom couple of years ago, we were on the unlimited package, since then the contract price has increased heavily and the coverage has decreased to a very poor connection and almost no Wi-Fi. Called Cell C's business helpline only to be asked 4 security questions on which I answered correctly but were told on many occasions that they could not further assist me with sorting out my problem as I answered these questions incorrectly and they would then just disconnect the line. This made me absolutely furious, I mailed them but were just given how sorry they were and a lot of empty promises of how they would look into the matter but nothing further improved.