Promise to call us with Update/feedback

We logged a complaint every week regarding our IPad. we get a phone call from Vodacom the next day to advise us they acknowledge our complaint and will solve this problem by the end of the week. they even promise to call us back. BUT still after they called us on Monday the 02Nov they promised to call us by the close of business that Monday to advise us of the situation but we have not heard anything back.<br> We are at this point at time we want to cancel all our contracts with Vodacom and want a refund due to we are paying for the upgrade but we do not have a device. <br> <br> How many times must we log a call to complaint???