I was heading east on Thomas right by 16th street this morning when a Dent Wizard van started to get over in my lane (middle lane) without using a turn signal and almost hitting my car. I honked my horn to alert them and they veered back over in their lane. When they transitioned over into the middle lane now driving behind me, there was a lady in the passenger seat with long curly hair (brunette) wearing glasses who then flipped me off. Once we passed the light at Thomas I headed towards N-51 and they were continuing to head east on Thomas. The gentleman driving the van, heavy set, glasses and an Amish beard stared me down and was screaming at me through the rolled up window. Probably not the smartest idea to do something like this when you're representing a company. Very unprofessional! And now because of this incident I will view Dent Wizard as an unprofessional company. If he and that woman treated me like this then who is to say they won't treat customer's like this. First impressions are everything and you never get a second chance to make a first impression.