Unpaid Tuition Fee

I have received a recovery email like the following, I studied two years abroad and paid the full tuition fee for those two years. My course didn't finish within the two years and go extended. I carried on but i couldn't get money to pay for the third year. So stopped going to the university from the second month on but didn't de-register myself as I thought the university will do it once they realize that i still haven't paid the fees So the university gave me warnings for payment and ultimately terminated by registration. Now they are asking me to stil pay for 5 months worth of fees which i cannot do, I received an email(which is given below) and a speed post with the following request and also mentioning that I defrauded them and that they will take civil and criminal action. Is that true? Will i have to go to jail if i cant find a way to pay them? Please let me know to my email :[deleted] ""This is in connection with the outstanding payment of € 6,584.81 along with collection cost and interest of € 782.02 due from you to " Delft University of Technology " towards unpaid tuition fees. Please find attached the copy of invoices for your ready reference. You are required to make arrangements for the remittance of the outstanding payment of € 7,366.83 directly in Delft University of Technology account immediately and confirm the details of remittance at the earliest, so that we can inform the client accordingly. Shall appreciate your earliest response on the same""