Nuisance Calls

[Joan2010]

I'm having trouble with nuisance calls late at night from a withheld number

The date of these calls was Friday 23rd January 2021

They occurred at 22:54 on and 22:55 on

is there any way for you to trace the number

[MI5]

@Joan2010 

You'll need to call customer service.
Numbers here Guide: Coronavirus Community Help and Support 
When it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say "Upgrade", "Lost/Stolen" or "Fraud" if you have to, to get put through to someone.
8.00am is the best time to call if you can.

https://www.o2.co.uk/help/safety-and-security/unwanted-calls-and-messages