If you have gone 7 years without using the account, they may have closed or disabled the account. Some sites will completely close an account if it hasn't been accessed or used in over 1 year. Maybe examplens will get a reply or a rep to come here and give some answers. Good luck.
I don't think they closed his account, regardless of inactivity, especially if he had funds there.
By any chance, is this exchange related to CCEX which is one of the popular exchanges before around 2014 to 2015?
They have nothing in common except the similarity in name. Otherwise, C-CEX ended up with a scam mark.