regular or composition

I had opted for Composition scheme, but had to come out of the scheme on 10/10/2017, because I have rental income also.So I was under the scheme from 01/07/2017 to 09/10/2017 and regular there after.But due to misunderstanding, I deposited the tax as regular from 01/07/2017 on wards and also filed GSTR3B.Now should I file GSTR4 from 01/07/17 to 09/10/17? How do I get refund of excess paid.