Upgrade date incorrect at 48 months!

I upgraded Jan2017 at the Vodacom shop in Clearwater Mall. I decided to check my "upgrade date" online two weeks ago as it is close to the 2year mark. Is showed that I could upgrade 2020/2021...This was clearly wrong. I called Vodacom and was informed that it was an error made at the shop. The system showed that the upgrade did take place in Jan2017, but the dates were wrong therefor the incorrect "update date". i was told that I HAD to visit the store. I did this the Saturday. The lady (Neo) checked the system to confirm the error, proceeded to fetch a document, informed me that she would have to send the document off, but that the manager would have to sign (he was not there). She took my number and promised to call me the Wednesday. She never did. I have tried to call the shop directly to speak to her, but it is always "busy". This must be corrected ASAP as i do not want any problems when my 2year contract is up in Jan2019!