Just bad service with a defective Stanly Drill

On 13/06/2015 I purchased a Stanley Hammer drill F/Max which I did not use immediately, when used the drill started to smell en went slow and returned the machine on 06 July 2015 to Farm City. On 10 July 2015 the manager of Farm City, Pierre van Ryneveld contacted me and informed me to get a new drill which was received on 12 July 2015. On Saturday 18 July 2015 the new drill stopped working on which I returned it on 21 July 15. A phone call was made from the farm City shop to an Ms A. Pretorius, during which I was told that I'm not using the drill correctly thus the reason for it to be broken this drill has a 3year guarantee??? I left the drill at the shop because Ms Pretorius could not allow me to talk in which I had to tell her to shut-up and give me an opportunity to talk. The drill was sold to me as a heavy duty drill, I'm an administrative office worker, how is it possible that a drill only works for 2 days, and then to be told that I work too hard with the drill.