I always thought that this development did not have all the permits [ may be wrong] and was being marketed in advance of getting them , a bit like some of the PW developments
If you buy at this stage prices are often very reasonable but you have the risk of delays etc
No doubt they will get the permits in due course
Surely your contract has a time limit after which you can cancel and activate the bank guarantee if the builder is slow in giving you back your deposit money and then you can move on to a developemnt which does have all the permits, a new ready now or re-sale and get a life style change now!
Your agent should help you with this and your lawyer, if not change lawyer
May be you are happy to wait and the price you paid is good value