No promos for existing customers

One of the reasons my family switched to TMobile is because they advertised that existing customers get the same promos as new customers.  Well that lasted for a little bit and know they are just like the other carriers.  No benefit for being a longtime customer.  And today I received a test that my bill is going up $5 per line. I understand and appreciate that it hasn't increased in 10 years, but now I have less benefits and the price is increasing.  TMobile I thought you were better than the other carriers!