Dryer Vent

My house is built on a slab and my dryer vent is under ground to the outside. I have lived here 9 years and had no problem with the dryer vent till now. I had a guy come to clean the vent out but when he put the brush down to clean the the vent, the brush came out with very wet lint. He did this only twice and then told me he couldn’t help cause he said there was water in the vented pipe. He charged me $170 bucks and went on his way, which was awful that he charged me that! Anyways, He said I probably needed to relocate the venting, but my utility room isn’t by an outer wall to relocate it easily. I live in Alabama and it gets very humid here in the summer, but like I said haven’t had a problem till now. Is there a way to get the water out of the pipe, I don’t know what a good solution to this problem would be. Do you have any ideas on this problem?

Thanks,
P.R.