No network connectivity for two weeks

I'm unhappy with cell c, for two weeks we have been having no stable network. I called their called centre and they gave me instructions on how to set my router on roaming, it worked for half a day and back to where it all began. Every time I try to connect I get poor connectivity on both the router and my other cell c simcard. I just wish they can sort this mess out. Since 1 October it's no network and I have couple of my colleagues on friends who are also complaining about this poor service.