After 3 months, my account is still not sorted - just no communication whatsoever

My first contact with Vox Telecom this year was 1 January 2024, to cancel my existing line and move it to a new address. To this day, 4 April 2024, the new line and contract with them is not finalised. Been struggling for a week for them to remove an incorrect billing on a debit order mandate (they want to bill me for 2 lines to the same ONT and address, which isn't even a possibility) and send me a new mandate. You call accounts & billing and you are number 130 in line (which obviously means we are not the only ones with an issue). Then you request a call back and there is nothing. You write to them on their whatsapp line, they keep responding "Ticket resolved" even if they resolve absolutely nothing. As I write this, I've been holding for 15minutes after a customer service agent tried to put me through to accounts. It is just the most shocking service experience that I have ever had! I can write a book on the last 3 months. I have a list of reference numbers, whatsapps and "no-reply" email responses from Vox, but the problem remains. I dont know if other ISPs are better, but I would never recommend Vox to anyone!