Nespresso bad quality products

I purchased a Nespresso inissia machine in June 2017. It had been having endless problems with airlock issues. It went back and forth to be repaired which was a waste of my time for such an expensive machine. After threatening and speaking to a manager, the machine was replaced. Within 2 days the same problem happened with new machine. It went back for repairs that the filter valve was broken. And this for a new machine. This is September already. I have been having the same airlock problems with the 2nd unit and I have now lodged another complaint with Nespresso. This unit is going back for checking. What a waste of my time boxing it again and waiting for an answer I have now requested a refund as I don't want it to be fixed or replaced. Your machined are bad quality yet you price it so high. I will rather go and purchase a dolce gusto machine. Disappointed in your company