Urban Company — double payment not refunded since past 1 year

Address:

Plama Heights, Bangalore, Karnataka, 560045

I had taken service from urban clap for installation of ac unit in bengaluru. While i paid through online but urbanclap said same not received and hence requested if same is paid by cash to their service person and later urban clap will refund the first made payment online in 3-4 days.
Believing urban clap and it’s brand i agreed their request but having sent lot of follow up emails and couple of calls with urban clap and their assurance, refund is still long pending.
I have shared all necessary documents and information to urban clap as per their request but still urban clap is not refunding.