A couple of years ago I ordered a domain, and I used it to test some things. So for clearance, I paid for it. I asked if I could use a webserver for testing and they agreed and gave me a free webserver to use, for a non-discussed period.
I used it, but after a couple of years I didn't use it anymore. When I got an invoice to pay, I thought that if I didn't pay it the domain would not extend and the webserver would be shut down. After that I did not look at the domain/webserver anymore, I've got an email that reminded me that if I didn't pay my domain would be deleted/sold and that was it. After that I didn't got any messages from the company.
After a while I was going to the website, and it was still online, I looked if I could still log in to the webserver and I could still log in and modify it. I have since sent other emails to the company and received no response.
Is it legal to use the domain/webserver? I don't pay anymore and have received no invoice. Could I be required to pay for all the years I had the domain but did not pay for it?
Note that I live in the Netherlands.