Overcharged and got no response. Terrible service!

Absolutely the worst service provider. I contacted a sales agent (Rory) to cancel my wifi Fibre service and downgrade me to a lower package. He confirmed that it was canceled and the new service was activated. The technicians came to remove my old service and install the new service. We have not used the old service for 3 months but I'm being billed for both services for the last 3 months. I contacted them again and spoke to a Ms Hendricks who also confirmed that the old service was canceled and that I would be refunded for the overcharged amounts. Nothing happened. I canceled the old service online also, nothing happened. I contacted my bank to reverse the debit order and now mweb disconnected my service due to arrears. I asked them to reconnect me and set-off what they owe me but no assistance was given. Would not recommend this service provider to anyone. Absolutely horrible customer service.