Bad service

I visited clear water telkom 8/09/2017 for an upgrade and the black lady (didnt get her name) , refused to upgrade me stating i can upgrade on month 22 yet i had written confirmation from services centre consultant from telkom that i am on month 21 and due for an upgrade.She just dismissed me and didnt even make an effort to call head office or customer care to verify my evidence.

I came back to the office and verified and all online telkom consultants verified that i am due for an upgrade i should go to the store.What should i do now?

I currently donot have a functioning phone and i am going on vacation next week i need a phone to take pictures.I am so annoyed.

Please assist because if i have to go back to that store, i am going to cause trouble there.I am a paying customer, i shouldnt be treated in this manne no matter what the person thinks of me.

Thanks