Cellc is Unfair

On Sunday February the 14th I attempted to participate in cellc's promotion as I received an sms earlier that if I buy 200mb or higher dataextenda I would receive 1 Gb. when I attempted to buy this data I received an error each time, I then called the helpline and was told that this was due to me cancelling my data contract I did not receive the bundle. This makes no sense to me and is unfair, I am still buying airtime and data which benefits cellc it's not like I have ported my number or anything, why am I exempt from this? It makes no sense and this is no way to treat a customer who has been loyal for so many years to this network and for all the money that I spend on this account. I am not one to complain but I have never been treated so unfairly this is really unacceptable, maybe I should consider porting elsewhere really and be loyal to other networks that will value me and be fair!