Auto Protection Plus I have ben trying to get a refund for four months santa ana, ca us

Jan 23, 2017, I purchased an extended warranty for my 2008 Chevy HHR.I paid $275.00 up front and was paying 148.05 per month.  My contreact number is SAM101710.  My last payment was supposed to be July 2018.  The contract was good for 48 months.  Mar. 20, 2018 I purchased a new car.  I called the company to canell the warranty.  They said I had to put it in writing. I mailed the letter Mar. 20.After a couple of weeks and I hadn't heard anything.  I called them.  They said it usually takes about  a month.  I waited a while and called again.  I was told by David (supposedly a supervisor) that my refund was mailed May 4.  Still, no check. 

I waited a little while and called again.  David told me the refund was mailed May 17.  They had told me the refund would be more than 1200.00.  They did put the initial 275.00 into my checking account.  Still no check.  I called and asked David if they could stop payment on the check and put the balance of the refund in my checking account.  He said no, I had to wait for the check.  Tomorrow makes four months since I asked for my refund, and I still don't have my money.  I have filed a complaint with the Cal. Attorney General.  Now they don't always answer the phone.  I think they have had plenty of time and I don't know what else to do.                                                                            Thank you,