Cancelled subscription in january but I still pay every month

Hi, I phoned to cancel my 2 sim cards in January and they haven't been cancelled yet! I have been paying out every month since! I can't get through to the phone number and can't find any emails. PLEASE HELP ME CANCEL THESE SIM CARDS! I HAVE PAID NEARLY €200 EUROS FOR SOMETHING THAT WAS MENT TO BE CANCELLED