The chair is working again. I have no idea why it stopped and then started again but for right now it’s ok And I’ll keep it.

I WAS SENT ANEW CHAIR And HAVE ENJOYED USING It BUT IT HAS STOPPED WORKING afterJUST TWO WEEKS. THIS is JUST RIDICULOUS. WHAT Do I DO NOW??? PLEASE DONT SEND ANOTHER CHAIR. PLEASE REFUND MY ACCOUNT and TAKE THIS CHAIR BACK. I’m 80 YEARS OLD. THIS HAS BEEN SO FRUSTRATING.  
I had to wait until someone could put it together for me. Finally on Saturday (December 4th) it came out of the boxes &was put together BUT the mechanism in the right arm only puts chair back. It doesn’t put chair back down. Chair was taken apart & then put together again but same thing happened SO I need you to send a new right arm for the chair. Thank you.