Call Centre and SIM swap not working

I did a SIM swap earlier today and while my smses are intermittently working I'm still told my service is suspended if I try to call. I have now phoned 808 over 10 times to try to resolve this. Every time I press 0 to speak to an operator as instructed, it asks me to hold, rings twice then cuts me off. This is impossible! I need urgent help please. If your call centre is down, have the courtesy to inform callers at the beginning of their call and offer them alternative routes to get help.