terrible first experience at Chessington World Of ...

terrible first experience at Chessington World Of Adventure. This is was my first experience and honestly I am disgusted by the discrimination I had faced along with my family. This theme park is one I would never recommend to anyone of my friends and family.

I had brought one ticket online five days prior to my trip - I had initially planned to buy the rest on the day. I had the Kelloggs "Grown ups go free" vouchers which are valid up until June 2020. I had checked both the Kelloggs and Chessington website to check whether the vouchers were valid or not on the date I wished to go (19/08/2019). There was no such information that the vouchers will not be valid on the day.

I had immediately went to complain on site who had asked me to email you and receive a refund and compensation for the discrimination my family and I had faced. I even called in the helpline this morning as directed by your website and also learnt from one of your staffs that the voucher was not valid from 20/08/2019 till 30/08/2019; meaning that the voucher was valid for yesterday.
I am truly very unhappy with my experiance and I will never consider Chessington as a choice for a day out; nor will I recommend it to anyone I know.
I would appreciate a response as soon as, and I would like compensation for what I had faced. Truly disgusted!