Hey @Fergality,
Welcome to the community and thanks for taking the time to post your issue on the forums.
I'm truly sorry to hear of the issues that you're having calling international numbers. Sorry for the amount of questions that I'm asking here but this can help us diagnose the issues that that you're having and hopefully get it fixed for you.
Does this happen when calling any specific country?
Does this happen at any particular time of day or does it happen, when whatever time that you make the calls?
Are people on the international numbers are able to call you without issues?
is it just international calls that you're having issues with?
Regards,
Steven_L