Or you can try emailing RK's boss directly; Steven. I'll pm his email to you. Don't wanna publicise here.

Oh I forgot to add, maybe you should lodge a PayPal dispute as well because RK insures their parcels even though you don't select the option. So you can probably get your $$ back from Paypal first and RK will get their refund later as well, so it won't be unfair to them because of the hopeless postal service/customs.