It is recommended to use personal wallet. Setting Electrum BTC wallet takes few minutes.
Everyone will be contacted still through email before/if refunds are to commence.
If you still contacted the investor for refund so there is no problem if i still sent my BTC from exchange wallet?
cause i sent my investment from exchange wallet
Yes of course, everyone will be contacted first if refunds are to commence. Many people are depositing in different ways, including exchanges and Shapeshift.