Sudden unexplained spike in Data usage-Query

I phoned the Cell C call centre on Monday 15/2/2015. I spoke to Sindiswe complaining that I had noticed a sudden spike in data usage over the past 4 day period. I could not account for this spike and I asked her to check and tell me what had been up/downloaded. She gave me ref no *** and promised to come back to me in 24-48 hours. I called today to follow up as nobody had come back to me. I first spoke to ?Keegan who was unhelpful, had a very bad phone connection and kept breaking up..I requested to be transferred to his supervisor. After another delay Sindiswe came on to the line. She insisted that she had not spoken to me on Monday, and that there are many Sindiswe's in the call Centre. I had to go through the whole ID verification process again, even tho I had JUST done so with Keegan. She could not identify the reason for the 1.3G spike over the weekend. Told me that my REF Number was invalid. Told me in a very patronising tone to log onto my account and examine the data usage myself!! She refused to cut and paste the information and email it to me as she said it was too much! Too much of \what\" she did not say...possibly TOO MUCH WORK??Still no answer to my query!!"