Brake Squeaking Noise problems of the 2014 Mazda MAZDA6

2-3 months ago I noticed that emergency hand brake was not holding the car again after recall has been completed back in Sep 2017. Now I always leave my car parked on the 1st gear (manual transmission). My mechanic said that calipers have never been replaced and they look original also he showed me that brake pads are not being released and get stuck really hard on the rear axis. I found the invoice and everything that has been replaced is "parking brake lever per recall order". Also Mazda declined fixing/replacing brake pads that have been worn out withing 1 year after I replaced them. They said that this can't be covered since the job has not been done by Mazda service and the parts were aftermarket. I had to change pads on the read axis 2 times in almost 1 year and now I have to do it again. Also I hear squeaking noise when I'm driving. I can hear that the pads are not completely released and touching brake disks. Almost a year before the recall my car rolled down the slope and blocked fairly busy road in washington DC. Luckily it didn't hit any car or person.