If you are drawing retainer fee as professional fee, then you would not have got CCA and other allowances. The TDS could have been 10%, if it is paid as professional charges u/s 194J but if you were paid as salary the TDS could have been as per the computation of your tax liability made by your employer u/s 192. So please check whether your status was that of employee or that of a service provider.
If you are an employee, you would have received Form No. 16 and if you are a service provider it would have been Form 16A. Pl check 26AS for the relevant section under which tax was deducted.
As you have received the notice from CPA marking your return as defective, you can rectify it by filling in the details of sundry debtors/creditors, cash and bank balances in Balance Sheet section and the details of gross receipts/profits and expenses in the P&L section in the return. However, pl. make sure that the TDS was in respect of your professional income and it was not in the nature of salary income. Otherwise, it may result in mismatch between TDS as per 26AS and TDS as claimed by you, though the amount is same.