$5 auto-pay discount, T-Mobile's breach of contract

I had been a loyal Verizon customer for some 30 years before moving over to T-Mobile some 5 to 7 years ago.  What I noticed very quickly after making the switch was that Verizon's customer service and coverage (with respect to the remote areas I sometimes travel to) were superior to T-Mobile's.  But I loved T-Mobiles no nonsense billing, no "yada, yada, yada" - I loved there transparent way of doing business.  You were told what your monthly amount was and that's what you paid, taxes and all with never an increase - no surprises.  That business plan was so refreshing that I was willing to accept a downgrade in the coverage and the customer service I enjoyed at Verizon (to be fair T-Mobile's customer service is also pretty good...or was).  But I was SHOCKED today when I learned of the  manipulative underhanded $10 increase T-Mobile is instituting through the autopay program.  For new customers, yes, I understand if they want to begin a program of discouraging use of credit cards.  But to do this to their loyal existing customers is disloyal, a disgrace and, yes, I believe a breach of contract.  It's nothing more than an increase in our bills that they promised would never happen.  I called today to voice my dis-pleasure and extreme disappointment with T-Mobile.  I advised them that I, for one, intend to join a class action lawsuit that is bound to initiate over this policy - and, for the first time since I joined T-Mobile I'm considering going back to Verizon to enjoy their superior coverage.  Suddenly the dropped phone calls and lack of coverage in the remote areas I experience with T-Mobile don't seem worth it.  I sense a distinct lack of loyalty now to T-Mobile within myself, that I don't even like.  I have that sick feeling in my stomach that comes when you know you are about to break up with your long time partner.  If anyone hears of a class action lawsuit that has started up, please let the rest of us know.