So disappointed by Vodacom service

After more than 20 years as a loyal Vodacom customer, I am so disappointed and disheartened by Vodacom's handling of my account. My account was in arrears for which I called in to make a payment arrangement. This account and the amount due includes two cell phone contracts and one unlimited fibre line. The payment arrangement was accepted by Vodacom, but what was not disclosed to me was that the Fibre line was not included in being transferred to a "prepaid" option whilst the payment arrangement was in place. After two successful payments towards the arrangement, I received a new invoice of over R6700, which was over and above that of the payment arrangement. I did not understand this and when I called Vodacom it was explained that my Fibre line was deleted and the new invoice of ~R6700 was for the balance of contract. After the third month payment which brought my original arears amount up to date, I was still billed each month for the fibre line, plus had the invoice for the balance of contract. A Vodacom accounts representative explained to me that my options were to pay up the balance of contract or request this to be set aside and apply for a new fibre line. My sybsequent application for a new fibre line was declined, and now I am being billed each month with no access to the fibre.