I just realized today that I have filled wrong band under HSMP previous earning category.
Country Code: A (Its correct since I work in UK)
Income Band: A (I should have provided 32,000+)
Amount Earned: £32,xxx (I have provided the salary for the year)
Country Income Earned: UK
To err is human!!! Please suggest what next

I have submitted all the documents like P60, Original Pay slips, Bank Statements, Letter from employer. I have provided the 32,000+ figure in my covering letter and the explanation documents. Also I have provided a separate covering letter for previous earnings where I have explained my earnings.
Do I write to them and tell them about the correction, the fee has been debited from my account so hopefully someone will start working on the case pretty soon

Thanks for your time.