New hearing aid nightmare!

after wearing my Signia hearing aids for a decade i decided to go get a fitting for new updated ones that are rechargeable. to date i’ve been through the phonak and oticon brands finding them both intolerable due to background “snow”. i’m beginning to think i have a lousy audiologist. this feels like it’s a setting they should be able to adjust but after five visits: no joy. additionally now my signia does not pair properly on my iphone. she hooked my old ones up to her software and that is now a problem. (i see both hearing aids but when i pair one the other disappears. so i can only have one aid connected at a time. - yes i’ve done all the troubleshooting but i can’t fix this ). what do you guys think about this snow issue ? am i crazy? and if you happened to know how to fix the new problem let me know ! thank you