Disappointed in Asics

On 9th April I contacted Asics about my running takkies GT2000 that were constantly giving me blisters. I thought it was a case of having to run it in but the more distance I ran the severe my blisters became. The rep was very accomodating and told me to simply take it back to where I purchased it and exchange it for the GT1000 as my older pair was a GT1000. I could give his name and call him from the store if there was a problem. I did that the same day only to be told by Sportsmans Warehouse it is not that simple. That it has nothing to do with the store but must come from Asics directly. I contacted the rep and with bit of back and forth he eventually gave me date of 23 April (2 weeks later) that a pair of GT1000 6 would be delivered to me from the headoffice. I could live with that, except it never materialised. I have contacted both the rep again and emailed the address he said I could follow up with but no feedback was given. What do I do?