FareDepot review: Overcharge and refund for the return ticket is not received

I booked my round trip New York - Buenos Aires in Feb 2020. Faredepot overcharged me 100 USD and despite several email exchanges, in which they lied constantly, they did not refund the overcharge. Whenever I wrote to them or call them, they kept lying, saying that the cheque is on the way but it never arrived. Soon after my arrival to Argentina, the airline cancelled the returning flight and announced that it will refund a part of the ticket and I need to get my refund via the booking agency. I have exchanged over 70 emails in the last 5 months with Faredepot and each time they put the blame on the airline and did nothing to refund my ticket. I am requesting 100 USD overcharge that was made when I first booked my ticket + the second part of my return flight, which has been cancelled by the airline following to global pandemic lockdown.