Prime X Contracting review: Fake charges about subscription 1

I was scammed by the company Prime X Contracting. These jerks took money from me without any warning. I have no idea for what really, but I contacted these jerks. The rep told me that I was subscribed for their services, but it was lie. I have no idea how it has happened. I tried to cancel the subscription, but the rep refused and hung up on me. I wonder if there are people, who face the same problems. What measures do you take in order to stop fake charges and subscription?