Worse service from internet provider

I have been receiving by far the worse service from MWEB, they don't care about their customers once they take your money, I've paid installation fees for a service thats never rendoured to us. They've deducted money from my bank account and internet hasn't been installed yet. I want to know how can we pay for a service that we never recieved. I've been trying to reach out via email and contact but no one gets back to either myself or my husband. The sales person cared about making a sale debited more then R1000 from my account but we aren't set up with the service yet. We are trying to get our money back bit I've been having no luck with getting into contact with them. I've been at their offices in Canal walk Cape Town only to find out that they no longer have a office and all working from home. This is by far a really bad internet service provider. All I want is just my money back. I don't understand how everyone is complaining most of their reviews is so bad but nothing gets done to these people and they just continue taking people's money. I've decided to make a case against them if that's the only way I'm going to get a response from them.