I do not have a open contract for 3 gigs . Who d

My account number is I***/9. An amount of R1799.48 was deducted from my account on 30th April. I duly stopped payment of this large amount and had same returned. On enquiring from Vodacom how this was made up I was informed that R483-38 was for my phone and R1316.10 was for my data for the open contract with NO LIMIT for 3 gigs???? Who changed my contract. I have a contract for R139.00 a month for 2 gigs which I found out has subsequently already fallen due in 2014 after 24 months. No notification received from Vodacom, no post, no email, no sms's NOTHING. On 15th January 2015 an sms's which advised me that my email address was incorrect ? My name had been incorrectly spelt? On 21st Jan an sms's thanking me for updated my email address. 30th March an sms advising Smart S sub increase for phone from R199 to R209 for my phone not the data?? Smsndd 21st April advising email address incorrect? My name is spelt incorrectly again. So how did I land up with a \NEW"unknown OPEN data contract? Who changed this? Not me and not according to the credit regulator? I watch my pennies so this is going to prove interesting. URGENT reply please"""