Horrible Contact Centre. Never able to help. 3 week wait times for issue resolution

I've had a horrible experience with Vumatel from the very beginning. It took nearly 3 weeks to get my fibre installed at my place and I had to follow up with them nearly every day to get it done, often waiting up to an hour on hold on their contact centre line. They then emailed me an installation fee bill via email with nothing else in the title or body of the email as to whether the amount was already debited from my bank or whether it still needed to be paid, or how. I then called Vumatel asking to understand whether the invoice was already automatically paid (as my internet service provider was) or if I needed to pay it. They were unable to help me and raised a ticket instead saying they would get back to me. Two weeks later all I get is another email from Vumatel with the same invoice, again with no instructions or information and an empty body of the email, so 2 weeks later I have the same question even though I was clear with their contact centre line what my exact inquiry was.