I just got my phone screen fixed and when I collected it the sim was locked. It’s telling me to put in my PUK code which is a 7 number code which it accepts then asks me to enter a new code of 4 digits and confirm that new code, so I go through with those steps and it just tells me then that the code is invalid and I have a certain number of attempts left. Before if my sim locked I only had to enter a 4 number code. Can anyone help please