Praise be to Allah.
If there is some doubt as to whether the vow was intended as something ongoing, then the basic principle is that you are not subject to the commitment, so if you do the thing you vowed to do one time, that is enough. You should also note that making vows is makrooh and it is just a means of getting something out of those who are stingy, as the Prophet (peace and blessings of Allaah be upon him) said. Vows are not a means of getting something good. But if one has made a vow then fulfilling it is an obligatory duty.