Unauthorise credit limit increase

I am writing today to complain of the poor service I received from your company. I have had an account with you for over 5 year. My monthly instalment was R650 and I have been paying over R700 a month to my surprised I was contacted by your agent claiming I owe over R3000 (she was rude and unprofessional) <br> <br> Edgars in East gate told me limit was increased in February 2014 at East gate Jet. I never gave any agent authority to increase my limit. I feel my rights as consumer have been infringed and if nothing will be done I will seek the recourse of the law, as I can't stand you poorly trained and unprofessional call centre agents phoning and victimising me.<br> <br> I am most annoyed that I continued receiving calls and letters of demand from your company for the mistakes you made. My impression of That EDCON has been tarnished, and I am now concerned about how my existing account with your firm will be managed. Furthermore, your company inability to update my online statement (still showing wrong amounts) has meant that you don't care about your customers, and this has made me incur travel and telephone expense.