I am from Romania and I just want to say I am so sorry you got into this situation. I do not know the guy from konvoi, I wrote a message to him, in Romanian, asking for clarifications but no answer also :(
This is already a second bad report about him so either he has serious problems (due to which he did a bad job - teiz's case, or did not finished at all - your case) or he just wants out of business. In both cases he should just reimburse you fully with a lot of apologies.
Again, I am so sorry about this. Hope it will sort out eventually.