On the verge of losing my job because of Disappointing service from Vodacom Fibre

I did a relocation and my fibre was installed on the 2nd March. On the 4th I requested a fibre upgrade as the current plan I'm on which is 20mbps upload and download doesn't reach that speed when tested by my potential company. I've since been waiting for that upgrade which was supposed to take 24-48 hrs according to the consultant.

I've spoken to to number of consults including Yanga Suka, Vodacom (External), Victoria Julius, Vodacom (External) & Curwen Boyd and they all haven't done much but tell me that the person who did the installation didn't close the ticket, so they're waiting on him.

I should've started my new job already but I'm on the verge of losing that job because of this fibre delay.