Missing 1 order because of no postage

I bought this as a gift for my daughter and her boyfriend. The product has been good that she has received so far since January 2021. However March order was sent without postage, therefore they did not receive it. They could not get to the post office in time to pay the postage. So post office sent it back. They have now been shorted 1 month and I cannot get a hold of anyone to tell them. I tried replying to an email that was sent to me telling me the next order was sent. We should really be able to have a direct way to contact them.