Cancelled contract within 2 days & being charged

Took out a data contract with Telkom on the evening of 24/9/2015. Was told I will be given pro-rata data till the end of month. I went home and connected the device to 2 ipads & a cell phone & within 10 minutes received messages on both ipads that it was \out of bundle". I could not access the internet!<br> The next morning I went to Telkom & they told me I had to bring my devices in for them to check as according to them I used data until midnight which was impossible as there was no data available.<br> The next day being 24/9/2015 I went back to Telkom & they checked my devices & told me they could find nothing that could have used 2"