Faulty product since purchase with terrible after sales service

Purchased a defy stove in 2018, on delivery stove was warped and skew, oven door and warmer draw was skew, retailer collected stove to send back to defy, a week or so later stove was returned, after a while while hob came loose, stove is seriously warped and oven door is skew, rack inside has even broken, registered call no ***, technician came out and took a part from inside the oven, on June 5th I received another sms from defy with ref ***, to date I received no call or feedback, since I purchased this stove brand new from an authorized retailer I have had endless problems with it and I am honestly tired of waiting for defy now, how long does it take to sort out the issue clearly this product is faulty