NO customer feedback

I have had a few good experiences on zando, however I have an ongoing issue since beginning of April that NO ONE has completed yet, all the tickets get marked as sorted but they have as yet to send me my return waybill for the defective item I have purchased from them, I have sent over 15 email queries, same reply saying they will get back to me within two days, however, NO REPLIES and No phone calls even after it says if you not satisfied reply here..... its been a month!!! Very disappointed,