Text message saying i'm going to be charged £4.50 a week?

So i got this message from 77games saying that i've been entered in an iphone giveaway which i didn't enter for £4.50.It says text stop to 82344 to stop it but i have no credit left! What do i do?
Can they seriously charge me? If so how?

Do nothing and tell your network. I suspect it's spam but definitely let your network know and register with the TPS

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