What to do with compose.io debt?

Question

Law in IT

Hello, I have a problem with a debt on compose.io and I don't know how to resolve it.
When I did my diploma, I picked up cloud databases, I decided to try their service. Trial 30 days, to create a database, you had to connect a credit card - connected. There was no money on the credit card and eventually I closed it. Their service did not suit me and, accordingly, I scored on it and did not use it anymore.
After some time, I began to receive SMS from my bank that they tried to write off n-bucks from a credit card that I did not have, and they say the operation was rejected because there was no money on it. Since I was too lazy to figure out who was there and what they were trying to write off (I already forgot who compose was and could not remember them - the company name was indicated in the SMS), in general, I scored the same.
Today they already called (my number is not listed anywhere in the profile ...), the answering machine spoke in Russian, they introduced themselves as an international credit debt company or something like that and asked to call the hotline to notify them of the repayment of the debt, that's all, not who I owe there and how much - nothing was said (I do not exclude that it was some kind of leftist divorce, I don’t want to call there yet).
Their account is not deleted, they ask to pay off the debt first, and I don’t have a desire to pay for a service that I didn’t use.
On the one hand, it’s my own fault that I scored, but on the other hand, it’s somehow not clear why the hell after a trial of 30 days they didn’t freeze the account.
As I understand it, nothing particularly threatens me, since I did not sign any documents with them, but I'm fed up already. What can be done?
I myself am from Ukraine, PrivatBank card.
Thank you.

Answer 1

Lose a card. To come to the bank they will issue a new one, as far as I know, for free. Or discard it and then order a new one.