Bad service and incorrect billing

On the 24 Jan 2020 my fibre line was installed and activated. The package I signed up for comes with a 2G data sim, I went to the mall of Africa telkom shop beginning of Feb 2020 to ask about the sim card since it was never given to me, I was told they ran out of sim cards, and that I must come back after a week. A week later I went back, I got the sim card, the sim card activated after 2 days but it still didn't have data loaded. I called the call center as I was getting frustrated on going to the shop and not getting assistance, call center agent told me to go back to the shop where I got the sim card. I went back to the shop, the consultant who assisted be logged an issue with technical team and gave me a reference number. The sim card still doesn't have data loaded on it, it's been over a month since my fibre contract was activated, and I'll be expected to pay the full amount when I'm not getting all the services I signed up for. I received a statement beginning of Feb 2020, I was overcharged and had to go to the shop to query the charges, which have since been fixed. If I knew this is the type of service I was signing for, I would have taken my fibre contract with another service provider.