Probably the original said that the terms were subject to change. What they should do is not the same as what they must do.

Sorry, it’s all in the fine print or a brochure they stick in with your statement. It’s up to you to keep up with their changes, not the other way around.

If they suddenly raise your interest rate, call and complain and threaten to transfer your balance to a different company. Then ask what they can do about lowering the interest rate to what it was before. If they don’t or can’t, then switch to a different card holder and transfer your balance to the new card which should have a lower rate.

Notification of change of terms by way of a separate LETTER is not required. The notification through the statement of account - may be fine print / super fine print, is an effective communication to you and you are bound by the said notified changes.

The credit card company can use a statement insert for a change in terms or print it on the statement. There is no requirement that they incur additional postage expense by making a separate mailing. It wouldn’t make any difference anyway because people who don’t read statement inserts don’t read letters.

A change in interest rate is not a change in terms if you have a variable rate card. The terms state something like “6% above the prime rate published in the Wall Street Journal”. It’s only a change in terms if they want to change the differential or change the base rate. They don’t need to send you a letter every time the prime changes because you could look online or in the paper at the library if you are concerned. They just print the rate for that month on the statement.

It’s also not a change in terms if the terms state that your rate will go to 29% if you miss a payment and then you miss a payment. It was already in your terms.