********** account added to my billing + Incorrect billing running

My fibre package changed due to a promotion, my instalment was meant to be R599, By the end of July I noticed that my billing was still the same , therefore we phoned vodacom, they asked us to test our speed and it was running on the new line, I had asked regarding my billing and I was told that its prorata, which did not make sense as I am meant to be paying less,

August month end I checked and the billing was still R699 ,I was frustrated but left it at that instance,

Sept month end I never checked my Vodacom debit order

then last week when checking my balance and debit orders that are set to go off I noticed that i am paying R1.7 / R1.8k a month as opposed to 1.1k, I phoned fibre customer care, then Noma checked and the first thing she says is that my account is in arrears hence why my instalment has changed,

I then had to explain to her i pay via debit order, there is no way that my account is in arrears, she then checked again and said that the account is correct, in which I had to correct her and mention that its two different lines linked to my account instead of 1, I gave her the account numbers linked to my statement,

only thereafter did she confirm that I am correct,

then she went onto saying that my package only changed in Aug, however I spoke to the "prorata" consultant in July, i then explained that i have proof of when the account changed /was submitted,

I asked for the billing departments contact details of which she said she cannot pass that info onto me, they will contact me with 48hours,

I received an email the day afterwards of a cancelled fibre account,I never cancelled any account, this was a ********** account linked to my name, then another email was received where Petra acknowledges receipt, apologizes and gives me an amount which is incorrect and informs me that account will be credited, and that the service ticket is now closed, out of courtesy she shouldve asked me if I would like a refund arranged?

and yet again Vodacom has gotten things wrong,I am constantly having to do Vodacoms job for them, kindly employ me as a Debtors team leader because this is not on...first i was handling my own support queries in the beginning of the year and now the debtors,

Here is a summary of my workings

Vodacom owes me R1875.26

My service changed in July ,and I was meant to be billed R599 (R699-R100)

therefore from July-Oct = R400.00

Sept debit for Fibre R1375.27- R599 = 776.27 Oct debit for Fibre R1297.99-R599=698.99

Your urgent assistance is requested, I would like a refund arranged and possible job offer :)

thank you,