Duvera Billing Services, LLC Consumer Loan Complaint

Duvera Billing Services, LLC Consumer Loan department,

Installment loan Managing the loan or lease Oregon

Went to pay loan in full ( $1500.00 ) within 90 days of no interest terms. Duvera financial revoked all terms of contract, applied back interest to date loan was originally issued because I was now calling 4 days past first payment date.Said I now owed Duvera $ -+ to Resolve loan. Refuse to help me resolve loan that day and still till now until I pay their demands. Now they say I owe them $2400.00 for a loan that is only 5 months old.