Shake everyday a joke and money making scheme!!

I have been a Vodacom contract customer for years now. I have been playing Vodacom shake everyday and only get entries into the draws. My kids and mother in law who are on prepaid have been winning free meals and cash vouchers every week or two. Im frustrated at this as I dont even think that these draws even take place. Am I not important to Vodacom because im on contract or is this shake everyday only for prepaid customers??