unbelievable amount on my statement

my problem started in march where by i had a problem with a cellphone Sonny Z 3 @ 1st the sim card was not detected on the cell and that problem lasted for a week ,consulted tried with different cell but still there was no luck and i was refereed to customer care Mid-rand and went strait to Sonny department and was assisted by the agent who had the same phone by that time ,He was the one who detected the problem and adv me to go to customer care where -by I was assisted by Senzo .He exchanged with a new nino and then my line was working.<br> A week after I experienced another problem the key pad was dialing long numbers automatically so I took it to Vodacom shop in South-gate Mall to show them and I was advised to take it to Jabulani Mall for repairs which i did and i was given ref no and it stays for 2 weeks .I receive a shocking statement for April on the 25/05/15 that I have to pay R9647.10 for that month and when i query about that i was told that i used so much data for March I logged a dispute I've got 2 reference numbers when I make a follow up and they kept on telling me that its still pending on the systhem and now the lines are closed.