Take money from credit card do not deliver service

I booked 3 air tickets through Gogogate on 16 August 2015.On 17 August I got e-mail from them stating they could not verify my bank details, tickets are cancelled. Nevertheless they still took all 3 ticket's money from my credit card,on 18 August 2015 and refunded only one, the other two still outstanding. I had to book the same tickets through another company.I keep on sending e-mails,requesting my money back,but Gogogate makes no effort in resolving this.<br>