Unsatisfied with Dell

Bought Dell in 2010 Inspiron N5010, during this interval, I replaced battery twice, keyboard once, hard disc once, and a lot of works. But now the condition and response from Dell is intolerable. I sent the laptop for service, and the repairer reset the BIOS, as a result it got locked on BIOS password without setting the password by anyone. I tried to contact dell, regaularly sending them mails, but firstly very slow response from their part, and after so many days, they replied you need to change motherboard. Without having any major issue, just by reseting the BIOS, they are asking me to change motherboard. Careless uneducated fellows are employed by DELL. Firstly they should made worthy laptops and secondly they should employ good technicians who can answer to our questions logically. Illitrate employees. Very unsatisfied with DELL. In future, will not buy any product from dell and will promote others not to buy anything from DELL.