First if it started very shortly after a refueling. Get the fuel removed and replaced. It may not be bad but you cannot chance it.

Describe the type of place you fueled at. Some places are still supplied by contracted bulk carriers. They might not bother to clean out a previous load of whatever they had on board before filling with diesel.

It is not always gas contamination you are dealing with. One of the primary reasons I do not want the most modern diesels. A load of bad fuel can cost you a bundle to address. I am driving a less sophisticated non Mercedes diesel right now. Large truck stops represent the safest filling places. I also use a higher volume local place. I know they are serviced by dedicated tankers. I still got a lot of water one time in the middle of winter there.