Not giving 3g offer data

I by Lumia 535 on 22 jan 2015 at 6 pm with this i have to get 500 mb 3g data on vodafone first vodafone sim inserted in within 24-48 hour but till today i not recieved any message and talk to customer care someone said plan will not active on sat -sun and one says it will take 10 days than why u have mentioned 24-48 hours on scheme