Speak to customer service and ask them to turn off notifications. It can only be done at their end.
@b4u2 have you managed to turn off the bundle call notifications or do you still need some assistance?
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@MI5 I used an O2 PAYG SIM a couple of years ago and you are right it can't be turned off, well it couldn't at the time - don't know about now - it's super annoying though!
@b4u2 wrote:
@Martin-O2
No it's very annoying.
Please help me out.
I'm failrly certain all @Martin-O2 can do is feedback your annoyance which I believe was done previously anyway.
No problem @b4u2 I'll check with the team to confirm if there is anyway to turn off these notifications. I'll give you a shout once I hear back. 
→ COVID-19 support - Help and support from O2 during the lockdown
→ Access for You: Registration - Find out how to register for our Access for You service.
→ Just joined the community or thinking of registering? Check out this handy starter guide!
→ Have a query about your account? See if the My O2 how-to guide will help
If you'd like to take part, why not register?
