I’ve booked and paid for a* night to Amsterdam with yourselves for myself and a friend...

I’ve booked and paid for a* night to Amsterdam with yourselves for myself and a friend ... after paying I called the number you said to ring to arrange the holiday ... the amount I paid which I didn’t get the discount on **... is being offered from Southend and a late night flight so we’d only get * days in Amsterdam .. was offered a flight from Stanstead on the **th august instead but have been asked for another £** each !!!! That’s not a cheap holiday now **.... do I have to pay the operator and is it safe to do so ???? Or can I cancel the two holidays I booked in faith with you ??