poor service

I would like to express my dissappointment with the Vodacom SP as it is obvious that they do appreciate my loyalty for over 6 years. @ the end of feb my contract was to expire so as per process I called beginning feb to cancel @ month end, spoke to Leseko on a monday who inturn offered me an upgrade with data plan and a micro sim to use on my handset for free instead of paying R 60 @VSP he said it will be with me by friday which didn't happen so I called back a week later spoke to Mpho who said will get Leseko to call back to no avail. I called again spoke to Thato who said the same thing again. A few days later spoke to a Sthembhile who said this is wrong dept and put me through to a Eric Tshabalala @ midrand centre who said he will. Escalate this issue and will call back a day later which never happened. I called back days later n spoke to Asando who said there is no Eric Tshabalala here \never heard of him"and the last person I s spoke to since was a Siswe who said will follow up and call back that too never happened. Please can somebody help me to end this contract as it is of no benefit to me and Vodacom has failed in its obligations to the contract and to me also"""