Every purchase and every managerial decision is determined by one thought only: to spend as little as possible. In the pursuit of saving and cost cutting, many fall into nasty traps I was warning you against in the previous post (5 Myths of Cheap Translation). Time to move on and see if there is anything you can do to spend less on translation.
Stick with one translation provider
Take some time to do a proper research and find a solid and reliable translation provider, then hold on to them till your pension do you part.