Non-existent customer service

I have had the worst experience since I joined in December 2025. From not having an internet connection for over 3 weeks (after paying for it upfront), then being double billed without reason or anyone bothering to look into it and fixing it, up to my cancellation request being ignored (all in a period of 6 months). Its just one issue after the other. I have requested a cancellation on 29 May 2026. Still no one has confirmed receipt of my cancellation, even after sending follow up e-mails requesting confirmation that my cancellation is being processed. I was told that someone from the Retentions Department will reach out to me, but over a week later, still no feedback.... Customer service is really lacking here. Only had issues from the start and now have issues trying to cancel - this has really just been an awful experience all round.