Nimble Collections

I was handed over to Nimble Collections by Capitec Bank in spite of an arrangement in place with Capitec Bank. I conveyed this to Nimble but they ignore me. I am harassed on a daily bases .... sometimes up to 14 calls a day from Nimble. I contacted Capitec Bank to enquire why both they and Nimble say I owe the money and both insist that I make payment to them (still waiting for a reply). I told Nimble I won't commit to a payment schedule until this has been resolved. They are not interested.... still continue harassing me.