@wandafanda Did you get a personal visit from a nurse or technician to fit the vest to you and make sure it is working optimally for you? If not, please put in a call to your pulmonologist to discuss. If it really isn't for you, it should be returned withing the allowed time, and another brand or type ordered.
"Silent quitting", putting it away when doesn't work, instead of taking action, provides NO feedback to your doctor or the manufacturer that the product is ineffective. And to have expensive medical gear sitting gathering dust after insurance or Medicare pays for it contributes to the high cost of health care.