Though I have tried hard to frame the statements from the Past Perfect Continuous Tense still a conversation is not possible in one tense only, so I have taken the help of other tenses as well to complete the dialogue . . Focus on how the dialogues in Past Perfect Continuous Tense have been framed.
Sumedh: Had you been also purchasing your balls in
wholesale from Ratan for some years ?
Megh : Yes, but why ?
Sumedh : I guess , he had been cheating on you.
Megh: But I don’t think so.
Sumedh : Because he had been cheating on me also.
Megh: But how can you say?
Sumedh: I had been purchasing my bats in wholesale for my shop from him.
Megh: From when ?
Sumedh: Since the last one year.
Megh: then what happened?
Sumdh: Earlier he had been selling stuff with good quality
material but now since he had got good growth in his business,
he had begun to add poor-quality material.
Megh: Oh, that’s why I had been having regular complaints from my
customers for some weeks.
Sumedh: Yes, same here.
Megh: So I guess, we must warn him against all these activities
at least once before we stop buying from him.
Sumedh: Yes, Let go
Megh: Let’s go.