Is there a way of cancelling a taxi booking when you don't know the company?

I’ve booked a taxi to the airport in the early morning tomorrow, but have just found out our flight time is different from the one the travel agent told us. But I booked the taxi through the general 55850 and can’t remember the name of the company we were transferred to. I have the taxi number. Is there any way to cancel the taxi without phoning every company?

How about calling to the general number and explain the situation.

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Thanks Belgian Pie. I had a friend try that for me but they don’t have a record of the call. I’m going to have to get up early and give the driver some lucky money.