Very Disappointed in a company trying to ***** from me after years of service

On the 15th May 2026, I made contact with Rain regarding cancelling after nearly 5 years of service. I was on a month to month basis and I called to ensure no further billing would take place on the 1st June 2026 after the cancelation has been confirmed. After all confirmations regarding my account being up-to-date, which it always has been because I pay the 1st of the month for the months service, I continue with the cancelation. They proceed to make arrangements for their router collection after the 31st May and everything is on board. On the 31st May 2026 at 10pm, our service ends. On the morning of the 1st June 2026, I get billed again. I make contact with their online services and they confirm that they will refund my account. 2 hours after all is confirmed for a refund, a very rude consultant calls me telling me I owe them this money for the month of May and I will not get a refund. At this point I lose it. I go online again and they confirm the refund but then change their story to say they have to check again because it might be a payment for the month of May. Bearing in mind, my account was up-to-date when I did the enquiry the 15th May 2026 and the online agent also confirmed that no deductions will take place. Luckily, I took screenshots of the conversation of the 15th May.