Android : Receive Quite Few Text Messages Off Companies Who Send Them Using PC - Appear As From Company Name Rather Than As Phone Number

Basically, I receive quite a few text messages off companies who send them using a PC, and so they appear as from the company name, rather than as a phone number. For example, texts from T-Mobile appear as from "T-Mobile". However, for some reason every text I get off a company starts a new thread, rather than all being in the same thread.