When I was a student, I studied in Ghent for six m...

When I was a student, I studied in Ghent for six months, so I had to pay that period to Farys (Sept 2016-Jan 2017). After that I never heard from them again, until June 2019. Then I kept getting warnings that I still had to pay for the last 2.5 years ?! I then emailed and called Farys customer service. They assured me on the phone that this was indeed an error because I had never received emails or letters from, for example, a bailiff or the like. They told me to resend the takeover document again and then forward all the credit notes to me. This was going to take some time and around September 2019 I indeed received a lot of credit notes, starting from February 2019. I thought this was finally over until I got an email from a bailiff that apparently this would not be over ?! I emailed them again but now of course they say that all of this would be wrong and I cannot prove this despite previous phone calls + the credit notes. I have never been treated so badly by a supplier and I do not recommend it to anyone!