Clarity on Debt Owed

I have two accounts with Vodacom which I’ve had for a years. I went into financial issues and I couldn’t pay one which was subsequently handed over even after I explained that I failed to meet arrangements because of financial issues but would subsequently do so which I did out of my OWN accord not because some collection agency contacted me. I made it very very clear that I would not engage with collection agency because I was paying the account. The other account is in good standing. Vodacom informed me that I owe about R4700 or so however today the collection agency informed me that I owe over R6000 after having paid over R3000 into the Vodacom account!!! As stated before I pay Vodacom directly, I have zero dealings with any collection agencies! What I want to know is what do I owe Vodacom after paying all the amounts I’ve paid into their accounts? Surely it should now only be about R2000 not over R6000! Please clarify and again note I will not deal with a collection agency. I started paying the account prior to the collection agency contacting me. If I can’t get clarity on these exorbitant amounts that I suddenly owe (over R6000) I will simply stop paying till VODACOM sends me a statement and tells me what it is that I owe failing which I stop paying simple. So please provide me with a statement of monies owed on the contract I had with Vodacom not some collection agency. I owe Vodacom for contract I had NOT a collection agency!