Charged double for same service

I am fed-up. I have send a retention trough on 2 of my accounts at Vodacom. In the retentions there was a 3g/laptop charge on the first of March for R70.18 (Note 01 March 2016) but after I paid my retention I received an invoice again on the same nr *** - Charged double for R80.01. Vodacom retentions can not help me - no information on the system - sorry - they transfer me to Legal department for accounts in arrears!!! I paid my retention - contract bought out not account in arrears!!! That person just said to me - sorry we can not access your account - nothing on system you are now prepaid - nothing we can do to assist you- Vodacom this is not the way to treat loyal clients - which was your clients for many many years. I had 6 contract - Also the same was done on *** - I never had sms on my apple ipad - it can not sms what so-ever - but on my last invoice after retention was done for R1967.32 I receive an invoice again for 100 sms'se!!! Both quotes was 01 March 2016 both was paid within 2 days - but Vodacom charges me again - no one can help me - nothing on the system- Just crazy!!! Up your game - I will cancel all my contracts and go to MTN