account escalating for no reason

On 16 April 2015 I received a message from Lancet stating that my account has been handed and I have been listed as a Defaulter. Needed to call or email to make arrangements for payment. The problem with the SMS was that the intitials on that sms were wrong were not mine I'm NA and the sms was addressed to NH wasn't even sure if that was mine. I sent an email and requested verification if indeed this was meant for was it really my account. They called and verified that it was indeed me and the mistake was on their part. My account escaleted initially it was R839 and it went to 860. I requested banking details and by sending that as well my account is now R876....<br> <br> Whose fault was it that I was billed on a wrong name? why do I have to pay for mistake that was done on your site