No address and land line

While looking on the internet for solar panels I came across Infinity Group Companies. They don't display and address and only a cell number. The cell no goes straight to voicemail. The answering service says "Infinity Solar Group and we sell car parts" I have also sent a request for a landline no and a address but received no response. When dealing with only online companies check that they have a address and a landline. Recommend you ask for proof of address if you are going to pay over large sums of money.