Granta magazine delivery

Has anyone who subscribed to Granta magazine experienced extraordinary delay in deliveries?

I subscribed this year and have yet to receive anything. After a few weeks from the first dispatch I contacted their customer service and they said they sent a replacement copy, which - surprise, surprise - has also not been delivered. It's been roughly two months and last thing I was told was to wait until November 20th. If it's not delivered by then they will look into it further.

I know that its pretty commonplace for delays to occur, especially with these literary magazines with small circulation (compared to other big publications, such as the New Yorker, which I get regularly, every week), but Granta told me they mail the issues by air and I just can't wrap my head around how a delivery can take this long if its sent on an airplane!

Does anyone have any insight or has anyone been through a similar experience with other publications?