FNB connect SIM card does not work during loadshedding

I have the FNB Connect package on my cellphone. During loadshedding I cannot get a network signal at all. That means in an emergency I cannot even make a call on my cellphone. I am sure the problem is with the Cell C network as friends who are on Vodacom or MTN do not have this problem. Although I have logged complaints with FNB Connect and they have been acknowledged by email I have not received information about why this happens or if they can fix it. I want to port back to Vodacom as this situation is untenable.