a contract is a contract there. you could "keep" calling them back to speak to like a team leader to try & get somewhere, if not,...
i would think of paying them off what i owe them for the remaining months, place the phone on ebay to recover some sort of costs, & starting again with a better network. better than losing more hair....
a friend of mine was always being called all mad hours by them too.
all about profit with networks rather than customer service these times, but with 3 it surely, clearly stands out from the rest.
their marketing sucks!....
i always walk past their stores!...
let us know what happens...best of luck.