Useless Accounts Team and Rude

I had fibre, sent a notice that i wont be carrying 31 May 2024, i return their router in good condition on friday the day i was suppose too, now tell me why would you debit my account aftet the fact when i returned your router in working condition and then proceed to be rude on the phone from your accounts guy? telling me i should have returned the router before debit run on the 26th shy would i return the router when my last day of use is 31 May a month i paid for and then shout at me? This is first step if i dont get my money back by tomorrow i take the next step dont shout at me and tell me this is how things are done. You got your router and in good working condition then debit me why?