I'm wondering what actually limits the size of the pacemaker? Is it the battery size? I often wonder why a more biological connected pacemaker hasn't been developed yet. A tiny circuit on the heart which uses the origin of the signal in the right atrium, then uses delay circuits and switches to allow current to pass through to different parts of the heart. No battery, just components using resistance etc.
How long ago was the pacer inserted? It will be sensitive for awhile, maybe a year. I'm pretty tall, and when I hug my shorter female relatives and friends, their chins hit my pacer and it still hurts a bit.
I don't know what kind of case you're looking for, but it is your choice to find another doctor so if you're looking for a legal you don't have one. Just find another doctor who will do it as you want unless your doctor can give you a good reason for not.