Batteries consumed quickly - unsatisfactory communication with the seller

The seller said it right away with a defect of my balance or an operator error during insertion of the cells, as otherwise no complaints had arisen in this article .... unsatisfactory :-(.
It is possible you know, everything, but as a customer-friendly, I felt not the answer.

The scale works equally properly and I consider myself smart enough properly use batteries without close shortly beforehand.
It remains for me as a customer anyway a stale aftertaste after communication with the seller, who passes on the blame for its customers without questions ... well, too bad