Purchase of notional service

I will have 40 years normal service done at the age of 63. I have purchased 3 years notional service through contributions which will allow me to retire on full pension at 60.
I'm now wondering did I do the right thing as I will probably work until I am 65 due to mortgage and other financial commitments. I didn't put a lot of thought into it except for giving me the option of retiring early. Would anyone have any knowledge on this and whether I should continue with it.

I assume you’re public service? Depends on the employer. Some will refund the payments some won’t. If you do the 40 years of actual service then the notional years are no benefit