How do I unsubscribe from Metro?

Excuse me, I was wondering if you could help me with a quick question about unsubscribing from Metro services. I've been receiving their updates and offers for some time now, but I'm no longer interested in continuing my subscription. I've looked through their website and couldn't find a clear way to unsubscribe. Could you please guide me through the process? I'd really appreciate your assistance in this matter. Thank you in advance.