Unable to block spam sms or forward to 7726

[K80]

Hi, I have recently started receiving spam SMS from a gambling site called WizardSlots. I have tried blocking them but they reappear the next day. I have never signed up for them so cannot login as suggested to unsubscribe.
I do not appear to have the option (iphone 5SE) to forward the messages to 7726.
Can someone sdvise how to stop these as they are driving me nuts.

[MI5 · Accepted solution]

@K80 

These may be premium texts so see help here Guide: Have you fallen for or been conned into a premium rate scam? What to do next 

Also www.payforitsucks.co.uk

To forward a text, long press on it, choose more, then tap the arrow shape bottom right.

[Bambino]

@K80 You also need to contact O2 and ask them to place the following bars on your account:
Bar all Direct to bill debits
Bar Premium rate numbers
You should also ask for a "charge to mobile" bar