very bad service from vodacom

iv been with vodacom for years now and the service from them is getting so bad now its not even funny. im able to upgrade so i went online to upgrade and a few hours later i got an sms saying there is no stock of the phone i wanted. i went in store and was told to call and cancel as it was done online so i did and they sent a request to cancel the upgrad and i was told it will take 24 - 48 hours ok no problem but it is now 5 days later i called them again they put in another request but still nothing im still waiting for them to just cancel it so i can go get the upgrade in store as the vodacom store has stock thats all i want it really cant be that hard, but looks like they just cant get it right been with vodacom since 2009.. 12 years on the same contract but i cant even get my upgrade due to no stock and laziness im really thinking about to just cancel my hole contract and move to a other provide.