Warning: SimpliSafe Won't Respond to Emails Regarding Refund

Like a lot of people, I took advantage of the "Black Friday" pricing on a system.  Put my order in on 11/15/19.  Website showed I was getting 30% off and a free camera.  Problem is, when I got billed, I did not get the discount or the free camera.  I got a few things I didn't order on top of it and charged over twice what my order showed when I submitted payment.

I notified customer service via email and was told I could only return the order once I got it, they could not stop the order and refund.  

So I received the order and I sent it back on 11/29/19.  I confirmed via tracking that SimpliSafe received the order back on 12/11/19.  Based on customer service feedback, I was going to get the refund posted in 5-7 business days.  I figured they were busy with the holidays, so I waited until 12/28/19 to ask about the status of the refund.  No response.  I emailed again on 1/2/20.  No response.  I emailed again on 1/10/20.  No response.  I sent a direct message to them on twitter.  No response.  So now I'm here, warning anyone that is considering buying this system, DON'T.  They've held over $400 from me since 12/11/19 (over a month ago).  They have quit responding to requests regarding the refund.  I can't tell you whether the product is good or not, but I can tell you based on my experience, they will not send a refund timely.  

Anyone dealt with this before or how I get someone from SimpliSafe to respond to me?