Only getting 0.75mb from a 100mb Cell C fibre - Haven't got above 50mb since fibre was connected

Today my fiber is 0,75 download. A new all time low, thanks Cell C... I'm paying for a 100mb line. My business is being effective badly, I have deadlines and manage a group of creatives over IP. No business - no cash. How does Cell C expect me to pay them and generate revenue if I cant use the tool they charging me to make revenue with?

I've been asking for months for a cash refund because I'm not getting the product they promised to deliver (I have meticulously taken screenshots of speed tests everyday). No one at Cell C support will give me the billing departments contact details either, when I asked the call centre representative why she thinks the billing department contact details are not made public, she rep**** ' I rather not reply cause I'll get into trouble'. Probably because of the sheer amount of people looking to get back what they haven't received.

They don't even have the correct address for my account. They have a street name and number I have never heard of...

Each month I keep up my end of the bargain, I'm still waiting for them to.