Whirlpool will you do the right thing

My daughter purchased a Whirlpool 7 kg front loader washing machine and a 8 kg tumble dryer from builders in Meadow Dale in February this year. As we were doing renovations the machine only went in April. We started getting an F06 error reading late May early June. We emailed them and got speedy service from this, However that was the last intelligent service we got. The first technical did not know the machine and did not know the error message, so he did what we had already done. The second, also did not know the machine or error message. So he said he would comeback, which he did around3 weeks later. He replaced a part and once again told us the following. When you place the washing in the tumble dryer it must not be to wet, and you must only fill it half. Why sell a 8 kg when you can only load 4. Our washing machine is a we whirlpool so if it is to wet its a whirlpool problem. The technician was hardly out the door when the F06 ready came up again. Unfortunately I have been ill for roughly six weeks so my daughter has had her hands full. We send an email again over 24 hours ago and now absolute silence from whirl pool. I did tell them that I though their technicians were talking a crock of horse Sh**