Debt collection — Brown and Joseph, Ltd (NH)

Attempted to collect wrong amount. On XX/XX/year>, I was at fault in a car accident. XXXX XXXX, through XXXX XXXX, originally demanded {$2200.00}. I began paying this balance in good faith and have proof of those payments. Without explanation or documentation, the balance was later increased to {$17000.00}, citing alleged frame damage. I requested supporting documentation such as photographs and itemized repair invoices, but instead I was sent an installment agreement requiring XXXX XXXXXXXX and stating the balance could continue to increase. The letters I received also threatened drivers license suspension. I am not refusing to pay. I already paid toward the original {$2200.00} balance and remain willing to resolve the matter. What I dispute is : The unexplained jump to {$17000.00