Karma resorts/ group scam

A few years ago we were offered a voucher in Nusadua by the shopping complex and also filled out the questionnaire and sat through the presentation until they wanted our credit card details. We won the free voucher for a 7 night stay at one of their resorts. Now so many years later this lady keep on phoning from so many different local numbers to get me to spend $150 booking fee over the phone to be able to book at one of their resorts. I feel like it's a scam to get my money. No thanks