I never had a boomer phone, but I am sure did not have to press so much buttons

No, 2 and 8 are 4 presses, please read the examples.

Still not working since '2' and '8' is 3 so the solution is 45 not 47.

You keep looping the result string the given n times. This keeps scrambling the text. To decrypt it, you must know how many times n was to unwrap it correctly.

Should be at the bottom-right of your screen, when it's not in full screen mode.

Maybe contact support team to help you?

It's how often you need to encrypt/ decrypt the text

The reach a digit you need to first cycle through all the letters for a given button. So if you wanted to type a '2' you would have to press that button four times (A -> B -> C -> 2).

For another example, to type a '9' you would have to press that button five times (W -> X -> Y -> Z -> 9)

Not an issue

You need to test your code with test values provided which you can see on the bottom right corner of your display window.