bad service regarding upgrading

Goodday. I recieved an sms saying i can upgrade,i went to vodacom at mall@redds i applyed for the upgrade,The lady said she need to wait for somthing 2/3 hours later i heard it was declinde no reasons.Two days later i got a call from a lady saying i may upgrade i explaind that i did apply but it was declindes she said she had the access to upgrade me.She upgraded me and said that i will recieve my new phone friday 02/03/18 or monday 05/03/18.When i phoned on monday afternoon still not recieveing the phone they told me it is out of stock.Still no feedback or anything.Not phoning the client and letting the client know there are no stock and still there is no answer to when i will recieve my phone