upgrading/ call center nightmares

i have a contract with Vodacom that includes finance options. the contract is currently still in place and active. i have been trying to do an upgrade since 1 Feb and after countless referrals , call backs and going to the shops i eventually managed to get a Upgrade confirmation on the 19th march. However, on the 6th of April i have no idea what is going on with the upgrade, no devise nothing. i keep on getting calls on my work telephone number, after repeatedly asking to call on my mobile phone. now i have been advised that the upgrade has been cancelled. and now I'm not able to upgrade anymore. i am tried of call Vodacom, spending hours on the call, just to get transferred, and disconnected , or just disconnected. this is pathetic service man