This is sadly not the correct fix as the votes happens on steemvoter.com, so to stop them would require to disable the account there. The @buildteam authority has nothing to do with this. Please read my in-depth comment on what happened here: https://steempeak.com/steemit/@reggaemuffin/re-cryptopiotr-am-i-a-victim-of-vote-stealing-perhaps-your-account-has-been-also-abused-and-you-don-t-even-know-it-20190515t154949895z