Faulty oven

I am not happy with the service I am receiving from Defy. I bought a DEFY oven at Hirsch's in December, and the oven is not working. Defy sent a technician to my house and replaced the defective part, but the issue reoccurred. Since then, DEFY has sent technicians again. I have had technicians at my house five different times.

When I followed up today, Defy informed me that they can only replace the oven if technicians have checked it three times. I advised them that we have had five visits from different technicians, but they only have a record of two visits. How can technicians come to my house, yet Defy claims they only sent them twice?

Besides the issue with my oven, this is also a security concern. Who has been coming to my house? How did they get my details? I regret buying a Defy oven.

Job Number ***.