Angry “former” client

Blake and Associate have been harassing me for the longest time. I made payment arrangements with them because my accounts were handed over to them. When my accounts were now handed over to a different company (Debt Cue), they started calling me, emailing me and sending SMS’s daily, saying that if I don’t pay they will take legal action. They asked me to email them proof that I’m with Debt Cue. I did that and I still receive these SMS’s. They make me sick! I don’t wanna lie. If this continues, I’m gonna take legal action against them.