Depletion of Data in 4 hours

On Wednesday, 6 September I signed up for the August deal, LTE 10GB+10GB(Day+Night) data and received the router and the setup of the device on Wednesday, 13 September at 14h45.I was told since its the middle of the month I would receive a pro-rata amount of data, 6Gb+6GB.(Day+Night).I wasnt present when it arrived (as I was at work) so my mom signed it off/ signed for it. A Telkom technician, Shahied assisted in regard. When I arrived home, I connected my mobile, the first device and only device to the Wifi. I used whatsapp and logged onto facebook for a few minutes at about 17h00. I did not do any mobile or application updates, i made sure they were switched off before conencting to the Wifi. At 19h00, that same evening the data was depleted. So within 4hours the data was gone?! Ive contacted Telkom and spoke to a consultant in the sales department only to be told "she does not know why or how this happend" with no further assitance or investigation, only confirming that all the data was indeed depleted in only 4 hours. I paid for a full month service only to be ******, with basically no use of the paid service. I expect a refund and a explanation as to why this happened or I want to cancel the contract immediately.