cheatting by uninor telecom service provider

Location/place: Habra

Name of company/service: student

I’m arup chatterjee. I’m using a uninor telecom connection. My mobile number is- 9126068846. The telecom service provider offered me at 13/11/12 at 3:27pm through sms that, if i recharge any type in my prepaid, i get 5000 local uninor to uninor second. I recharge my prepaid at 11:18pm. But i cn’t get the offer.
When i contact the customer care of uninor prepaid, the customer care executive deny to talk with me and block my line for 3day from the customer care of uninor prepaid.