On the face of it, this case appears to be very worrying.
A lot is dependent upon what correspondence you had previously received from your council. BUT... If you sent an income and expenditure breakdown to them BEFORE they engaged bailiffs then you should have been considered for an attachment order. Simply not having sufficient income is no excuse for the council to bulldoze on with bailiffs.
As others have alluded to, you should now write to the council and raise the point regarding their hasty decision to use bailiffs as opposed to the more logical option of an attachment. It is very important for you to also outline your vulnerability, much of which should be already on their records.
I recently endured an almost identical scenario to yours. I had to fight tooth and nail with the council over every aspect. What became clear to me is that they won't concede an inch without a fight.