Dear lady Sir

Dear lady Sir
(Samsung to the firm) purpose for me to leave you o letter of complaint it turns out that the electric oven, which you recently bought from you, is faulty it was working fine at first. Then it became faulty heating degrees are not in the norm. The specified time is not working propenly.
For this reason, l ask you to help me in case. I want you to replace the electric Owen with a new one.