Time Warner Cable straight rip off on promotions Milwaukee Nationwide

I signed up for a special promotion on recieving a dell 100.00 certificate good at dell store to buy a Tablet. Every time I call them to get information about it they say I will recieve a certificate by mail and internet email, of which they never did. Ive called them back and even talked to supervisors and all they do is run me around in circles saying yes I do qualify for it but I still havent recieved a thing          This runaround has been going on now for over 6 months and it requird 3 months continious service which I have completed and exceeded.  They also agreed I do have it coming by a supervisor but still nothing and my bill almost doubled this is a total ripoff corporate scam to m, all want is what I have coming and nomore run around.