The executive will only be able to work on a clear TZ. It may question the truth of your right. There is only his point of view, there is no purpose to satisfy the needs of the customer.
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The completed part of the work (the executive decided that all the work was done 100%, in fact I still need to do it) was done quality. There are knowledge, skills and experience.
Please note, I did not write a clear TZ performance. There was the condition of "working under the cylinder" only unfortunately the executor himself determined what is under the key, and what is not already in the course of the work.
If you have a clear TZ and understanding that the accompanying tasks on TZ are already taken into account in TZ, then I recommend that executor. Everything will be done in time!