Scammers are spoofing bank phone numbers to rob victims
It can be a very convincing trick… “You can check the number in your display online sir. You’ll see I’m really calling from your bank.” That is, of course, if you are unaware that phone numbers can be spoofed. Then again, they wouldn’t be successful scammers if they weren’t convincing. If you suggest calling them…

This is a scam by a company called market by brand. Basically what they do is send unsolicited text messages to list of mobile phone numbers. Just receiving the text messages means you pay £3 to the company. The message looks like spam so most just ignore it. Those who complain get a refund by cheque which takes 15 days to arrive.
The company makes a profit from all those who don't realise what's happened and continue to pay a few pounds a month.
If you have received a text message like this the PLEASE COMPLAIN to Phone Pay Plus who regulate this market on 0300 30 300 20.
Their web site is http://www.phonepayplus.org.uk/.