Delete remote branch on bitbucket

Hi, we exceeded the limit of space our repository https://bitbucket.org/reali-dev/price-prediction/src/master/ I can not remove any branch for example (release/0.5.23, dev, latestQA-changes) we do not need them, I tried to do https://confluence.atlassian.com/bitbucket/reduce-repository-size-321848262.html but it did not help