Credit note for a second handsetg

On the 28th of February I logged a query with Vodacom because they have been charging me for two handsets instead of one. I was given ref: 1- ********** 325810. I was told it would take up to 7 days to resolve the query. On the 12th of March I made a call again to do a follow up on my query and these calls they last up to 2 hours holding trying to explain yourself. This time I was given ref:1- ********** ********** . On the 16th of March I received a message saying your query with ref number 1- ********** ********** has been closed. I then made a call when I saw the sms and was told they had refunded a credit not of R2600 into my Vodacom. I then asked them to reverse the money and put it on my bank account because that is where they have been taking from. On the 22nd of March I was given another ref: 1- ********** 5....because the refund that were going to action into my account was incorrect because it had already minus the old premium that was including the second handset I am disputing. On the 23rd of March I was given ref: 1- ********** ********** just called Vodacom they saying they will refund me R1200 which is even lesser than the figure I was disputing on Friday.