Hello Stephlowther,
Thanks for joining our Community.
Sorry though to hear about the wrong number showing when you call.
Can you please follow these steps, and let us know how get on making a call.
• Go to Settings.
• Scroll down and click Phone.
• Click My Number.
• Tap the number showing and edit it with the correct number.
• Click OK.
• Click Save.
• Turn off device.
• Turn on device again after at least 30 seconds have passed.
Gareth_L