Unable to cancel subscription

We've moved to another country and sold our vehicles. We've already sent this company a cancellation request in November 2018. They are not doing their job in cancelling the subscription from my account. I've received an email toady from them to say that I have reached the ultimate amount of emails to them and therefore their system won't process my emails anymore and that I need to contact another number now if I have any enquiries. Really? They are rather quick to take your money, but won"t take your emails.