A substantial increase in your telephone bill is an indication your company could be the victim of Private Automatic Branch Exchange (PABX) fraud. Detailed billing will assist in identifying any potential unauthorised calls, usually International calls but they can also be National telephone calls. Another indicator is where customers trying to dial, in or employees trying to dial out, find that the lines are always busy.
Fraud perpetrators may cold call you claiming there are problems with your computer and they can help you to solve them. Those fraud perpetrators often use the names of well-known companies such as Microsoft, Apple or IBM. They could even use the name of your broadband provider to sound more legitimate.