Refunds on investments can be provided, subject to this being requested before the investment is settled. Settlements happen on the last day of the investment month.

For example: you have invested on the 21st of October. You can get a refund if this is requested before the 31st of October. 

Once an investment is settled, refunds can no longer be issued. In that case, should you wish to no longer hold the shares, you can relist them on Yielders' secondary market for other investors to buy.