Tds revised return

We are private Ltd Co.. We have deducted 5000 tds on professional fess on 31st March 2018 and paid the same tds on 25th April 2018 and filed the tds return by may 2018.. But we should I have deducted tds of Rs 10000 on 31st march 2018. On 25th September we have paid balance 5000 tds selecting year a.y. 2018--19 and also paid 450 as late payment fees with the said challan
Now i want to file revised tds return how should I process. The tds is of same party.. I have already shown tds of 5000 for same party in original return.. Can I adjust this extra 5000 tds in revised return.. In revised tds return what date should u show of deduction as I have paid late fees of Rs. 450 should I show deduction date 31st march or 30th April 2018.
Any important points i have to kept in mind while filing revised return.. Please specify.. What will be due date for the revised return to be filed for the above transaction