I normally send them e-mails and they get back to me within 24 hours.
I like the email way because it gives them time to think about the answer but more often than not my email and question to them gets a return telephone call so doesn’t give me much time to think about there response.
Thankfully in the 11 years I’ve been with them I’ve only needed to contact them a handful of times and last call was over a year ago so don’t know if something has changed at there end since then.
On one occasion I did respond to an article about TPMS in their Life Styles mag and someone rang me even though I was just making a remark about them saying that TPMS is great for disabled drivers and I told them its not when it gives false alarms but anyway I was surprised to get a call from them when I was just remarking to a magazine article.