Travelstart should up their correspondence with Customer's disputes

In less that 24 hours the flight I am trying to cancel with Travelstart will be taking off. I have on numerous occasions tried to contact them to cancel tomorrow's flight to the USA and to reschedule my travel to other dates. The latest feedback I got was yesterday where they said that they will contact me to discuss the new dates. I received an email where they asked my new dates, I have given it, but still no feedback on whether tomorrow's flights are cancelled. My fear is the amount of money I can lose if they do not cancel in time.