Brinks Home Security Will not issue my refund Farmers Branch Texas

on April 7th I signed the doc cancelling Brinks Home Service agreement. Returned all the equipment which has been confirmed by UPS and Brinks. They were to issue a refund for an additional touch pad that's has been returned and verified by them on April 7th. I get nothing but the runaround. I am told the check is in the mail....we did not process it correctly but will be there in a few days....we issued you a credit on your brinks account( which has been cancelled)......we cannot issues checks but will credit your credit card. This has been going on 2 and 1/2 months. Last week I was guaranteed it would be credited to my card within 48 hrs. It's been a week. 
They absolutely have no intention on refunding my money year it appears. Funny part is they told me in the beginning the pad was mine to use 1 month for evaluation and if I liked it I would be billed. They billed my within 2 days of receiving it. The install was ordered in February but they never came out to install until the end of March. I returned the pad within 2 days of the system activation and cancelled the contract and docusigned the cancellation. They have gave me the run around about that as well. Thank goodness I have all the records saved and printed. Every time I call they play stupid and first tell me the equipment was not returned but once I argue it has been and you signed off on it I get placed on hold up to 15 minutes and when they get back on they tell me the check is in the mail and as of last week the card will be credited.
I want my refund now as I am done being jerked around