Horrible service ! unacceptble charges, lies ! Lies ! LIES ! And hours on the phone with no result

i been a loyal att customer for many many years ! MY STUPIDITY ! MY BAD ! Every couple of months on the phone with att ( an hour or two ) to change plans and to make sure I will not be charged huge amounts of money, while T-Mobile or Verizon offers such good rates , including international travel. Hours later , ATT was coming up with a solution, and for a year the bills were under control ( still higher then their competition, my husband is with T-Mobile ) but relatively good enough not to go trough the trouble of changing. This month the bill comes to 550 $ ! I been away for 4 days , but in a resort with wireless , so no way I could have roam . Get on the phone with ATT, one person , 45 minutes, next supervisor starts again all the questions from the beginning , another 20 minutes....and we are not even close for me to voice my problem . I work as most people do, I do not have more then an hour to spare to talk with ATT , actually I have no time at all to be on the phone with a company that it's set up to make it difficult to voice a problem and explain a complaint ...who asks you the same questions 3 times in a row ? Who gets you to a supervisor that start ps again by asking your name and passcode ? Someone that wants to just rip you off !!!! That's who . It doesn't pay to be loyal to a company , because they never keep their promises, it doesn't pay to be nice and not complain publicly !!!! So this is going on social media , RUN AWAY FROM ATT !