That's certainly unprofessional...and when you interview (free phone consult?) more Ts, be sure to notice if they do that on the phone! Ts should only interrupt when you both have agreed for T not to let you get off track, or because of time constraints/insurance limits on sessions... but in general if a T doesn't let you talk, how do they know what your issue is? They're assuming they know already? If they're that smart then let them write down your solutions and forget future sessions altogether

Ok... seek out certified, trained therapists (clinical psychologists) for real help... though maybe even some of them forget "the rules"

I once was forced by the insurance company to see a psychiatrist who was to do an IME for them... and I sware, he would parrot my every word into a microphone for recording...as I spoke! I think they do this just to irritate disabled patients. They're sick!

Keep searching...