Super Escapes

I booked a hoilday going on Saturday next week, after being sold a package deal that was more expensive as we went along, and I felt I was pressured into all the add ons, one of the passager as not got the all clear from the doctor which isnt our fault and now I am being charge more than the hoilday its self to change the name so someone can go instead and now I cant use my voucher to wards this how unfair is this not even gone on this hoilday yet I am so upset and would never travel with this company again.