[atlas] Problem in stopping measuraments

Hello, I've got a issue trying to stop a measurament. I used the RIPE normally last year and I started to use it again two weeks ago. I realized that one experiment was still running since last year and I tried to stop it by using the REST API as described in the documentation. Unfortunately, it did not work. Thus, I tried to stop in the web interface and it did not work either. I do not know how to proceed in order to stop it. The credits got negative even I denied this kind of situation in my profile. Anyone had the same problem? The measurament ID of my experiment is 1791052. Thank you, Elverton.