Vodacom competitions

My phone number was apparently selected for one of Vodacom's competitions. I was initially asked to pay 50% of the courier fee, which i didn'tmind as my prize was amazing. However, I got suspicious when the caller from vodacom kept asking me to make more payments to "make it one reference". I was told that I would be reimbursed for all my payments. Then I got even more suspicious and angry when I got called from the Floor manager saying he had taken over my case to help me get my prize as my payment "were stuck on the roll" and were 3 references instead of one. The manager then said to correct the error I now need to make another payment of R2400 to make it 1 reference and then I can get my prize, but he did ensure me that I would be reimbursed again for all the payments. I was also told that if I don't make the payment they will give the prize to someone else! Money doesn't grow on trees and I've already made 3 payments!

This is unacceptable!! I refuse to make any more payments as I will be the one to loose in the end.