Unacceptable

I app**** for a phone contract on saturday 28 october 2017 and was aproved and was told to get my samsung galaxy s7 edge on Wednesday 01 november 2017 an i did that.... when i got to my vodacom store in staderton thay told me sorry no stock , so i said its fine i will get the regular s7 that thay have in stock amd i was declined even though it is a smaller contract...... The device is an engagement prrssent to my fiancee and because no one even told me that there os no stock i had to move my plans to get engaged tonight .... i am not happy at all