You’d have to assume (obviously) it’s shared infrastructure and there’s little that can be done except wait. EE and Three still share some masts (I think) so you have two choices. 1) Wait and hope for a swift resolution or 2) Switch to Voda/O2 or one of their mvno’s.
You’d be silly to not consider it but all I’d say is if you’re overall happy with Three it might be worth trying to get a timeline on your issue,and then make a decision. Good luck mate.
