Vodafone cheated byoffering invalid plan

I saw this online that vodafone has launched a new plan of 159 under which they are providing unlimited data plan for one month. But this plan is available for special customers and to find out wheather one is eligible for this plan, he has to find that out by dialing some number from their phone. But this is mentioned nowhere in the plan details. This is a serious scam which vodafone is doing. I felt like cheated. I am done with vodafone now and I am going to switch back to Airtel now. by by vodafone. I will make sure no one in my circule use vodafone any more.