Advertising a deal and not honoring it

Been a client of Vodacom for almost a decade. Vodacom advertised a deal on Facebook which i was really interested in. You did not honour this Vodacom. After a number of calls, leaving messages for management to call me back. Emails to your complaints department. Still no joy. You disappointed me and put a really sour taste in my mouth after being with you guys for almost 10 years having 3 contracts with your Company. I have now cancelled my 2 cell contracts with your company as they could not assist me in anyway and hopefully i move to another provider were i can be treated well and valued. One disappointed customer !!!!!!