@Nanda0 I am sorry to have to say Nanda, but it was you who cancelled the reservation for the dates you are trying to unblock.
When a potential guest wants to cancel a reservation for one reason or another they will face a financial penalty! The only time they can get all their money back is if they can have the host cancel the booking......and ABB are actively telling guests this, and further more does the cancelling for the guest on the hosts behalf!
You no doubt received from Airbnb an email which said....
John wishes to cancel his stay at 'Little house surrounded........' To give John time to make other arangements you have 48 hours to respond. If we do not here from you in that time we will cancel Johns reservation!
Now when you get this you think that Airbnb are being the good guys here and are helping everyone out so you don't do anything further! What happens is your silence deems you responsible for the cancellation......Nanda, it's rotten, but that's the way it is.
You must never on any occasion cancel a confirmed booking!!! You must always state that you are prepared to host the guest thereby forcing them to initiate the cancellation on their end.
I would suggest to you that you get onto ABB in Indonesia (sorry I can't provide a phone number) through social media (ABB Facebook page) and plead your case that you did not wish to cancel John's reservation and the cancellation came about by a deceptive email you received from Airbnb, and they may release you from penalty.
I am sorry Nanda, but you did do the cancelling and that's all there is to it!
Cheers.....Rob