Still waiting for refund after 3 MONTHS!!

Booked and paid for a flight on Travelstart on 21 April 2021. Four hours later, Travelstart informed me that the booking was cancelled. I contacted Travelstart to enquire about the reason for the cancellation as payment reflected on my bank statement. I sent them proof of statement. Since then, I have sent them weekly emails enquiring about the refund, but I only get a email stating that they have contacted the airline. I made a business deal with Travelstart and feel that they must refund me.