EXTREME LACK OF PRODUCT QUALITY CONTROL AND LACK OF SERVICE

I purchase a box of erasable markers from Parrot Products for online Math tutoring. The first pen was totally dry, which I discarded. The second marker lasted several months. All the others were dry, and could not be used. I lodged a quality complaint. Parrot Products admitted they had a quality problem with the markers. The replacement pens were "lost" on their way to me on two occasions. I then lodged an official ISO9001 complaint at the ISO certification company and Parrot Products. The first replacement box contained only 5 useable markers, the other 5 were dry. I lodged another complain, where Parrot said they "never check the outgoing products". The next 10 I received were even worse than the previous box. I again lodged a complaint, both at Parrot and also at the certification company, and received no response. What value does the ISO9001 certification have??????????