Breach of contract by Virgin Active, refusing entry to card holder.

As a 2 year signed member and card holder, Thursday the 2nd of Feb, I am shocked that I received the following treatment from your Sun Valley branch. I arrived 5 minutes late for my trainer to begin session (after warning him of some unforeseen delays), load-shedding was on, upon entering the premises at the counter, the scanning device was offline or not working, the staff were completing forms with a long queue waiting, people had to sign the form and fill in their details before entering. I didn't have my reading glasses which made it very hard to see what I was meant to complete. I asked the assistant very nicely that I am struggling to complete or read where to input some info, I said "come on, you know me, here's my card", I began to proceed towards to gate and was told, "you may not go in". As a member, I am appalled that I received this treatment. No where on signing the contract anything further is required but my card to make use of your premises. Would you have preferred I camped outside and make a scene??? Honestly I could sue you for this treatment! I demand a personal apology and in future if your staff denies me entry, I will take you all to the cleaners.