The DOT Service located at dotservice.com is a scam, especially important for those with farms or businesses that have vehicles with DOT numbers. Several citizens have recently received letters with the letterhead of "DotService.com" in the letter, the scammer’s tell you that your DOT number is not updated and must be or you can be fined $1,000/day and possible deactivation of your DOT#. The scammers then request you log in to a website and provide your credit card.
The Wisconsin DMV has confirmed this is not legit. This is not affiliated with DOT and is not the proper way to update your DOT number.
A Dot Compliance Group Scam
If you get this letter, throw it away. If you have family and friends that have trucks with DOT numbers, please pass this information on to them.