If it is a legitimate service, you should:
If the company isn’t legitimate, check your phone bill online or contact your service provider to see if you’ve been charged.
If you have been they can advise you on how to stop being charged again in the future.
If you believe the text message is spam, you can report this directly to your mobile phone provider.
All operators now use 7726 as the number to use to report spam texts messages, which is free of charge.
You'll get a message back when you text this number asking you to send a second text with the actual number that texted you.
If you’ve already tried this you can make another complaint to your mobile service provider.
If you’re unable to contact the company or they fail to resolve your complaint, contact the UK regulator for content, goods and services, charged to a phone bill -PSA.
You can call their free helpline on 0300 30 300 20 from 9.30am - 12.30m Monday to Friday.
If a particular service is found to be 'misleading' by PSA, you may also be entitled to a refund.
In most cases though, refunds will not be given to those who agree - accidentally or not - to receive premium rate text messages.
You can ask your phone network provider to bar all premium rate calls or texts from being made from your phone.
Simply contact your provider and ask them to set this bar for your phone number.