special levy includes insurance and management fees??

We received a special levy request from Strata Manager asking for the full year insurance cost and the next two quarters of the strata management fee, and 7 days to pay. This was never brought to a meeting or in any way discussed with the owners. Is this in any way even possible? We have had an AGM 5 months ago where the regular levies were set and agreed upon, and paid for the first two quarters as normal. Suddenly Strata Manager has sent the owners an emailed Special Levy request for $1500 to pay for the Insurance for the whole year, reason given is that the Insurers have raised the cost by 25%; plus they want the next two quarters management fees, reason given that there is no more money to cover management fees. This is a small complex with only 4 lots. I am pretty worried by these requests. Any advice?