Samsung 14th Avenue Service is a joke

My mobile device went in for Mic Speaker repair fault the first time. When I received my mobile back, the unit had Android5.0 on it after I specifically asked them to not upgrade any software should any repairs take place. This is why I have reluctantly used the device and stuck it out with my Note 4. About a month ago I decided to move my info back to the S5. During this time Ive had lots of complaints regarding my mic speaker from people im calling. Well, im back at Samsung 14th Avenue for an issue with my S5 again.After sitting and waiting nearly 2 hours to see a technician (you need more staff!!!!!), I have to deal with a ****y Petrash, arguing with me about the problem with phone. After speaking to Taariq (Manager) they both don't seem to understand when I said im not booking it in due to the **** service I received the 1st time it was booked in. My repair took a month the last time and I had to call all the time to find out what is happening with my phone. Unfortunately there is not enough characters left for me to elaborate more on the bad service from that department... Trust Samsung will contact me regarding this matter....