Moreover, in a separate release, RBI said it has cancelled registration certificate of four NBFCs.
Out of the seven firms who have returned their licences, six are based in Mumbai and one in Pune.
These companies include Eureka Finvest, Baroda Industries, VH Doshi & Sons Investment and Vinodchandra Doshi Investment Co Pvt Ltd.
The companies, whose licences have been cancelled are Kolkata-based Neelanjali Engineering and Novoflex Tradecom, Mumbai's Guide Investments and Trading and Pune-headquartered Enol Ventures.
"As such, the companies cannot transact the business of non-banking financial institution", RBI added.