Came oft (ērcheto). Imperfect tense denotes repetitions, no adverb for “oft” in the Greek.
Avenge me of (ekdikēson me apo). A late verb for doing justice, protecting one from another (note both ek and apo, here). Deissmann (Light from the Ancient East, pp. 420ff.) quotes a stēlē of the second century b.c. with a prayer for vengeance for a Jewish girl that had been murdered which has this very verb ekdikeō.