Follow up on poor customer service...7 days later

xactly a whole week later.....zero resolution Waiting for my account to be credited. The insurance department has done all due process as advised by Felix, the supervisor in that department. I was advised via SMS on Tuesday evening, 21 September that my issue was sorted and the enquiry call log was thus closed. They however haven't contacted me to tell me what exactly they did for this resolution, because they sent me the sms after hours I had to call Vodacom again the next morning. I was advised that my credit had been passed on 21 Sep, and was told my account would be credited within 24 hours....didn't happen so I gave them until Friday 23 Sep only to be told that I must now speak to the accounts department, I could not get through after more than 54 minutes on hold. They refuse to give me a refund, which is fine but I need proof that my account was credited with that amount. Just checked the latest invoice and nope...nothing. so according to the insurance supervisor. Vodacom said my account is in arrears....which is not correct, they billed me incorrectly after confirming my amount due at end August. If I don't check my bill every month this is what happens. Then every single month there is an argument and fight about being billed incorrectly. This is unacceptable, its not my job to be a watch dog on a top up contract, the contract is a set amount for the 48 month period. I'm beyond angry, and I'm going to sit on them until I get my credit. This is *******....23 years a client and this is how we get treated....not on!