R2.50 per second billing???are you serious?

I was called in October by FNB connect to add a data contract to my FNB profile.The contract is 1GB day and 1GB night. on the 1st December i get billed R820.00 . i call on the 02/12/2015 and speak to Ntabiseng moloi and she cannot give me any answers.She advises me that she will escalate and get back to me. I phoned them this morning 09/12/2015 speak to Kagiso and he says i was billed out of bundle rates.I asked for a statement or proof that i used that much data, he said he cant give me those details.They say i had to soft lock my contract.Listen to that sales call, nothing of this discussed.I get a call at 16h00 on 09/12/2015 from Nthabiseng Rasala stating that i was billed out of bundle.I ask how much was out of bundle she cant answer me.I ask what the rate is out of bundle she says, R2.50 per second billing!!! on a data contract? This is absurd!!! i double check and ask her if i use the internet for 4seconds i get billed R10? she said yes. She even confirms that this is excluded from the sales script as they know clients wont accept this. I requested the contract be cancelled with immediate effect due to witholding info that wouldve changed my decision to accept the contract!