Bad service

I took up a contract with Vumatel in 2021, they took forever to install but were quick to start start with the debit order from my account. The installed wifi service worked for a few minutes and has not worked since. I have tried to get in contact with this company but there are no human being working there that you can speak to or escalate the problem with. I've been directed to their whatsapp line but they don't respond on that line either. It always times out because there's no one responding to messages. I've asked for this service to be cancelled but they can't get that right either. I'm at a loss for words and so frustrated with Vumatel.