No response to emails

I was overcharged when first billed (discount code wasn't applied).  I emailed customer service and was promised a refund (April 1).  Also one of the sensors did not work. Emailed back on April 16th that I still hadn't received the refund.  Still no reply or refund.  Others in the forum state long wait times on phone or getting cut off after being on hold for hours.  

I also bought two door locks that I do not like and would like to return.  If not resolved by next week I'll return the entire system and try someone that hopefully has better customer service.