Samsung washer/dryer combo factory reject

Having purchased a Samsung washer/dryer combo from a Samsung Store at gateway, I am totally dissatisfied with the unit. The machine was bought in October 2018. In March 2019 the door seal was leaking badly and the machine was not drying clothes The technician came out and replaced door seal and drain pump. I called the technician the same day to tell him that the drum is now knocking the door and still not drying-said he would come check. 3 calls later no assistance. In may 2019 I went back to the Samsung store and complained again the door is leaking and still not drying including many error codes now... technician came out again.they now want to replace the door/door seal/main PCB and sensors. I feel this is unacceptable considering the parts have failed twice. My request to have the machine replaced with a new unit was rejected due to the unit now being 7 months old. Samsung has failed to realise the same parts have failed straight after the repair. Could Samsung kindly assist in this matter. Please contact me on ********** 945.my reference number is ********** 316 Granted Timothy from Samsung store has been be trying to assist but Samsung needs to make the call on replacement of the unit. Regards Michael