Regardless of how much money you received on top of the 25% tax free lump sum, you would pay 20% tax on it up to the higher rate tax point (£50,270) – any money above this figure would be taxed at 40%.
So unless you have no income at all, you should have limited the pension amount you took out (ignoring the 25% tax free amount) to £50,270 - £21,500 = £28,770; only paying 20% tax on the amount, then take the remainder in the following tax year, paying 20% tax.
But it is too late to undo what is done now.
I have heard of cases where the tax office considers this one off income increase to be something that will be regular going forward, and it takes a bit of time to sort things out.
In your situation, if it proves to be that you have paid too much tax, I would expect them to adjust your tax code such that you get any money owed back through not paying so much tax in the next tax year.