Why you always want to overcharge and the credit not refund!won't allow this to happen again

Good day. I called last month about a billing error it was fixed now I have a credit. Then I get a settlement quote via email a month later. I do not agree to be debited for the settlement amount. I will not after you already deduct the money accept the credit as I need the money. You have before debited me for double the amount and just credit not refund. This is a big quote and how must I buy groceries if you debit me.after last month I refuse to believe you will just take credit amount and not settlement as this is a quote and I do not accept the quote. I want written proof that I will not be debited.