VODACOM SUCKS!!!!!!!

I am totally and utterly disgusted at the level of service I am receiving from VODACOM. Since my upgrade in September 2016 I have had endless problems. 1. With the upgrade I received an additional FREE SIM CARD (supposedly free of charge) however they have been billing me for this every month 2. On enquiry I was told to go back to the store and take it up with them -(to which I answered I most certainly will not as this was the offering in the Vodacom Booklet sent from HO to all stores) 3. Every month its the same battle trying to get this sorted even though I still paid the Invoice amount in full 4 So eventually on the 26th of July I called again :-( and spoke to a lady (Thembagazi) who upon checking my account confirmed with me that not only was I paying more than my actual Invoice, Vodacom was still charging me the additional R55.00 a month for the Free Sim Card and I explained the situation again to which she then gave me a reference no and did the recon and confirmed with me that I should only pay an amount of R77.00 for the month of August and the accounts dept will pass the credit and my account within 14 days- last nite after discovering my phone is soft locked I have been trying to get it resolved!!!yes you guessed it -I CANNOT SEEM TO GET ANYWHERE WITH VODACOM- THE ANSWERS I GET IS YOUR ACCOUNT IS IN ARREARS PLEASE MAKE IMMEDIATE PAYMENT - BUT WE SEE ON THE SYSTEM THAT THERE IS A CREDIT DUE TO YOU.!!! I HAVE BEEN ON THE PHONE THE WHOLE OF SATURDAY TRYING TO GET THROUGH TO THE FINANCE DEPT TO RESOLVE THIS AND MY CALL ARE CUT BUT NOBODY CALLS ME BACK !!!!!!!!! I have also just paid an amount of R420.00 ON THE 28th of August. Can somebody that is actually clued up on the service please HELP!!!!!!!!!!