Incorrect debit order amount almost 3 times the actual value and then refusing to refund me

I recently had an upgrade done via Elite Mobile which I strongly DON'T recommend! Its painful to go into a physical store as it takes long but at least there is less chance of a ****** up. They contacted me earlier this year saying I qualify for an upgrade. I responded that I don't want to take out a new contract until my current handset is fully paid up. They said no problem and then gave me a call in June 2018. I then asked them to confirm if my current handset was fully paid up before taking on the upgrade. They confirmed that it was fully paid up and from July 2018 I will only be billed for my new handset and contract. To my surprise the new handset (phone) was received within days. My debit order for Vodacom is dated the 1st of every month or 1st working day of the month on 2nd July 2018 Vodacom debited my account with R3541.17 which came as a huge shock to me I contacted Vodacom only to find there were 2 problems: 1st problem being that apparently I'm not finished paying for my current handset and still owe Vodacom 3 months. I told them this is not what was confirmed or agreed with Elite Mobile and I would like this to be reversed and I would like an investigation done and listen to the recordings where I clearly tell the agent I don't want to pay for 2 handsets at the same time and to confirm why the consultant said I was fully paid up and now Vodacom says I still owe them for 3 months? I'm not prepared to pay for 2 handsets at the same time and want this issue to be resolved. I logged a case with Vodacom. They said it would take 7 working days for them to revert with a solution to this problem. I logged this call 5th July 2018 and no one from Vodacom has contacted me to resolve this issue up to date 17th July 2018 and that is now well over the 7 working days. In the meantime the 2nd problem was that the Vodacom call center agent made an error and debited me upfront for my new handset a total of R2066.38 incl. VAT. They apologized and stated they would refund me within 48 hours needless to say that did not happen. I called again and they once again apologized saying there was an error on their system. They assured me that I would be refunded within 48 hours. Once again nothing happened. On 17th July 2018 I received a credit of only R259.59. I called Vodacom again and spent 1 hour on the phone speaking to various departments including billing, only to be told that they credited part of my refund to next month's (August) debit order and the balance of R259.59 was left, and this is the amount they have refunded to me. I was and am very upset and angry. How can Vodacom decide to allocate it as a credit without asking or informing me first and before my bill is actually due!!! All this time promising the refund in cash to my account. This is totally unacceptable and absurd as I am relying on this money to pay other expenses that are due before the end of the month. They just decide to take it ahead of time. It's Vodacom's error... why must I suffer a double debit due to an error Vodacom made? Anyway after a long time on the phone Trevino from the billing department has informed me that they will refund me the full amount but it will take up to 5 working days! Which this is also not acceptable! It's Vodacom's error and I should get my refund immediately with no waiting period. I am so angry that after 17 years of using Vodacom as a provider, I want to move my contract over to a different service provider.