Package stuck in customs for over two months

I had a package sent via DHL from an online retailer in the US which arrived in customs on 11 December 2014 (waybill GM***). Since then, the package seems to have vanished, even though DHL has confirmed it's still with customs.<br> <br> So, I spoke to the retailer, and they very kindly replaced my goods at no cost and sent them again via DHL (waybill GM***). Yet again though, the package arrived at customs and has again been held with no notification.<br> <br> One parcel I could write off as a mistake, but two? This is theft, plain and simple!<br> <br>