Settlement with many calls and no one that knows their job

My nightmare started 25 Jan 2018 with Finchoice. A call to the company I ask the last I want to settle my account. I ask her will they make sure please that they don't put the debit order through she said they won't if I pay today and send the proof of payment . I did so after I got my settlement agreement. On the 30th Jan 2018 they debit my account I went to my bank reversed the debit order still at the bank I phoned them again told the next call centre guy I all ready reversed it the must take the debit order of my bank account. NOT LISTENING what I said they also put the money back in my account. Not even 5min later I get a message threatening me I better pay them back or I will pay collection fees. Today 5th Feb again I phoned were I was told I owe them money. I paid the money I send the proof of payment . They phoned me 11 times were I had to get so rude with them and put the phone down Do this company train they people Do they read their Emails ? Are they going to pay my bank fees all my phone calls that they waisted ? I will never deal with them ever.