Unhappy client

I was called about 4 days ago and i was told that they calling from Telkom working with blue label as my number was selected for one their promotions and i have won a R20 000 and Samsung s24 but i need buy a OTT voucher for R600 to activate my sim card under blue label and they told me to dial *130*7277*my last 4 digits of my cell number# and after dialing it i received a message from Sars saying that the information i entered doesn't mach as they couldn't help me going forward and i lost my R600 and even the floor manager couldn't do anything so I'm not quite sure it was a ****m or what as they never got back to me