Since you had pledged your Mutual fund units to get trading margin, you cannot sell these units before they are unpledged.
Kindly reach out to our customer service team through the following means to unpledge your Mutual Units:
Please make sure that you clear any outstanding dues/debit in your account before raising the unpledge request. It takes around 2 working days for units to be unpledged. Once these units are unpledged, you can sell your Mutual fund units.