Travelstart a no no

Agent Talent and agent Lisindwe says I must ignore Travelstart's request via email "copy of card or original card that was used to make the booking must be shown at check-in-desk. Should you not have either, the airline may deny boarding". As I am not accompanying the traveller and will not give a copy of credit card, how do I solve this problem as the feedback from above agent's are "take it or leave".