Worst Service Ever from an ISP

I've app**** for Fibre at my home through Supersonic on a Black Friday Offer, explaining that I need it active by 6 Jan '25 since my LTE will then be cancelled. I submitted all the required documentation. Long story short, I heard nothing regarding an installation date and started e-mailing and calling them. Every call takes at least 10 minutes to be answered and very time the feedback was different, but basically that they're waiting for Vumatel.

I called Vumatel who said that Supersonic closed the ticket!! I was fuming. So, called Supersonic again, after writing another e-mail to which I got no response. I just called them again, and there is still no definitive solution, while we're stuck without any connectivity. This is the worst service I've received from an ISP/Reseller ever. There is either huge lack of training or no interest in customer satisfaction. The clock is ticking and our frustration levels are rising!!