Sleep specialist -- seeking a new one

I was diagnosed with sleep apnea many years ago. After many trials and errors, I finally found a CPAP mask that I can tolerate, and I use it regularly.  However, I can no longer tolerate my sleep specialty practice, California Center for Sleep Disorders (CCSD). Even before the pandemic, they cut back on staff -- eliminated the receptionist, for example, who used to answer phone calls. Everything now goes through a voicemail tree.  Almost a year ago when I had an urgent question, that voicemail system persistently led me back to a full voicemail inbox, so there was no way to leave a message.  Emails written on the "contact us" form on the website were never answered.  I used to deal with the CCSD office in Alameda, but I had identical communication issues with other offices -- in fact, different phone numbers for at least three offices I called last year all led to the same full voicemail inbox. I would love referrals to other sleep specialists/practices with whom people are satisfied.