WHO TAKES responsibility for 'HACKED' line

In January 2015 I experienced a problem with my Telkom 3G data service (20gig), where all my data was mysteriously consumed over the period of 2 nights on the first few working days of the month. I reported this to the call center service department and was advised to reset the security protocol on my account. I duly did this and created usernames and passwords that no one would have access to accept myself. To my surprise the same thing happened in April and in May 2015. I reported the problem and complained that my data service has been hacked. This is a service which I paid for and did not receive. Worse enough that my daughter depends on it for her studies and had to use the VODACOM 3G ****le (with 1gig) that never got hacked. Reference number after reference no( case no. ***2