They probably haven't removed it then. You will need to go back to the shop
https://www.o2.co.uk/help/safety-and-security/age-restricted-content-and-age-verification
Or you could give customer services a call and explain what's happened and see if they can lift it again
Hi @Justasjanulis19 , how are you getting on with this since you last posted? Did rebooting help with the restriction? If not, any help from customer service as adviced by @Cleoriff above? 
Let us know if you need any additional help at any point.
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