My OH did eventually agree to have, and wear, hearing aids (NHS). They weren't perfect, but still a massive improvement.
Unfortunately, his hearing has continued to deteriorate but he won't go back to see if they can be altered or changed, despite the problems he's having.
I cringe every time I hear him on the phone.
Nine times out of ten, he can't tell what the speaker is saying, though I can be in a different part of the house and hear them clearly enough - I end up shouting the answers to the caller myself, which I have sometimes thought must make it seem as if there is a very controlling woman in the background who won't let him think for himself!
(Oh will still insist that he couldn't hear them because they were mumbling, even if he was in the kitchen and I could hear them from the bedroom upstairs!!!)
Non slip/slip resistant bath mats