Why are we being penalized suddenly for paying with a credit card?

Unfortunately T-Mobile is not the only one doing this.  With all of the breaches to accounts there is no way I'm handing over either my bank account or my Debit card (which has the highest use of theft).  I switched from Verizon to save money but unfortunately I am going to have to sacrifice some coverage to reduce my bill.  Maybe if enough people did that someone would get the picture.  I don't need to use my phone for work and as long as texting works I will be fine.  But I am not fine with a $150 bill each month for 3 phones.