unable to receive calls for the whole day 14/10/20

I started noticing that I wasn't receiving calls on my cellphone around 10am then I double checked mycall settings still no joy no matter what number I use to call my mtnn number it just goes straigh to sub n/a . Outgoing calls are fine. Then I called the call centre on 808 the agent just told me they have a network problem I must call *** and that number went to voicemail saying their business hrs are from 8am tothis has s eriously inconvienience me for the whole day as I have missed important work calls. I'm so annoyed with such a service I'm a loyal contract customer from 2007 but all they do to thank me is th this .