Daffy I am sorry that you lost your phone and that it obviously had some sensitive photos on it that you don't want anyone to see.
However no network would be able to block access to these for whoever stole the phone. If there had been a telephone customer services number they would have told you just the same.
As I said in your previous thread (itself the 4th thread on the topic) it's time to accept your situation and move on.
NONE of this is giffgaffs fault - you are just deluding yourself.