No response to customer query/complaint

I had an issue with a Rust-oleum Painter's Touch product and completed the website contact form in early January. There was no response, but I thought this was due to the firm closing over new year. I repeated the message on Jan 23. Again no response. As I had saved a copy of the message, I sent it to the email address *** on Feb 12. No response to date. The next step would be to call, but I do want to waste valuable minutes when there is a mechanism for the firm to respond. The US head office does not have an email address and it is obviously not practical to call their customer service number. This is supposed to be a "premium" product, but the SA region's service could hardly be described as such.