How long is Cell C's 48 hours?

So I installed a fiber line to my home and got a Fiber router contract from Cell C. Router was brought to my home on the 31st of August at 18h00 and installed so all good and well, but when I got my bill I'm charged for Fiber use from the 25th to the 31st of August which doesn't make sense as I didn't have a router. Then I phoned customer care on the 17th of September, was eventually redirected to billing and they opened a dispute on the amount and stated I will get feedback in 48 hours.... yeh... On the 24th of September I phoned them again but the customer care numbers doesn't work so sent an email and they phoned me back. They stated they will raise the concern will their billing department and I will get feedback within 48 hours even after I told them I have been waiting a week for there 48 hours to pass... Today is the 30 of September and I am still waiting on feedback on my dispute. Can someone please tell me how long Cell C's 48 hours are cause I taught they make use of the standard time system but obviously their 48 hours is longer than 14 days (336 normal hours)???????