Bank account frozen by cyber department

Earlier I have received a notice by the Bank in respect of my query of "the reason for freezing my Bank account". They told me that Cyber cell telengana Police has instructed them to freeze my Bank account and they send me an acknowledgement number. Then I contacted with the respected cyber cell. According to them a victim of online fraud lodged an complaint against someone and from the suspects account there is several money transfer to various Bank account. And he transferred some amount to my Friends Bank account. My friend has also send me some amount what he had lended from me earlier. So according to the authorities my Bank account is linked in this chain money transfer so they have frozen my account too. When I clarify the whole things to them and said that the money that has transferred to me is a regular transfer and I am not involved in any part of the crime they told me to refund the amount to the victim person what my friend send me to my account. At first I hesitate then they convinced me that after the refund they will mail my bank for unfreeze. Now on the Basic of there account details they provided to me I send the amount. But they didn't unfreezed my account till now. What should I do now??