Welcome to our Community and thanks so much for your post - I have located the account and can see that this feature is listed free of charge and has been on the line since the account was created.
We'll be more than happy to get this removed for you; I'll need to pop you a Private Message so we can go through security. Once the request has been submitted, the feature will be removed within 24 hours.
In the meantime, anyone calling you who has a withheld number can call 1470 before calling your number and they'll be able to get through.
Please look out for the Purple Envelope in the top right of the page and pop me a reply when you can.