I contacted Meridian yesterday to ask about replacement drives for my G91 and I too had trouble with the contact facility. In my case, it turned out it didn't like "/" in the enquiry text. Removed that, all fine.
I think it's a great pity how Meridian have changed over the years, a vastly reduced product set and support (even firmware) only through dealers who may or may not be pleased to help if you didn't buy from them and/or are not interested in new product.
I assume they have done all of this to survive, but it doesn't encourage brand loyalty.