Vodacom not willing to let me go!!

Vodacom is not willing to terminate my contract even though I paid the quotation for early termination. I still continue to receive monthly invoices for numbers that are not in use. Vodashop has been unable to assist and call centre sends me back to Vodashop. As soon as I get somewhere, I am told my account is in arrears and cannnot be cancelled until updated. Siphi na apha?