Cannot make calls or use data from 21/05

good day<br> <br> i am unable to make calls or use any data on my phone. <br> when i try to make a call it gives me a message that the service has been suspended and i must contact the customer care no.<br> customer care has been offline, and when i went to the gateway store, i was told that nothing can be done as the head office is on strike - only once they are back it can be sorted out.<br> <br> i did not receive any message that the service was suspended<br> <br> my account was with nashua mobile and changed over to MTN recently<br> <br> please assist<br> i did send an email to the customer care but there was no response