vodacom customer service is worst by the day

Vodacom has done it again. After them not being able to find my contract, then now they doing to me what they did 2 years back when i tried to upgrade, take 3 weeks to get an upgrade. I called 3 weeks back to upgrade and everything went smoothly and i was advised that someone will call me to verify my order. when they eventually called me after 5 days after numeruous follows ups when they called to verify, they advised me that the phone i want is actually out of stock now, and that they will cancel my order and ensure that someone calls me. imagine my horror when i called 3 days later to find out that the order hasnt been cancelled and i have to wait again for the verification office to cancel that order. 2 days later i called again (bare in mind am the one doing all these callings nd follow ups) and they were able to take my order that was on Sunday, till today am still waiting for the verification office to call me now, its been 3 weeks on these journey.. what is going on? will i get any assistance