If you want to improve your lot at THY tell the agency representing the airline that you are not interested unless some of the contract is ammended. If you read the contract you are NOT guranteed a seat anywhere at any time. You WILL be deducted pay if you do not fly the hours on your roster. You WILL in all probability be out of work in twelve months. With a 1000 EURO for housing in Istanbul you could probably rent a "rolled up newspaper in the corner of septic tank" for housing.
The contract is rubbish and if you accept it now and go to work for THY, do not cry and moan to this website that there are pilots at THY working the same DEC positions that have better deals than you. These type of contracts can be negotiated by the pilots. The problem is that pilots jump on the shiney plane and the prospect of employment without reading the fine print and more importantly,without knowing OUR own value to the company. Remember you have a skill that is in demand and they want to pay you as little as possible for that skill....