Tracker has the poorest service of all time

I got a call from 2 different Tracker agents today. Whilst, I was on the call with another tracker agent another one called again. I told the second one that i was on the call with another agent from your company and she said no we don't have record of that call. This is the poorest level of customer service i have ever seen.

First of all you charged me double the amount we agreed on since the contract begin i stopped the debit order, because you don't charge my account without my agreement whatsoever. and then i made efforts to call you and one of your agents was rude to me. I left a massage on your site but no one responded but you kept on charging my account. Yesterday your agent called me and she said she would look into my account and get back to me today at 9am, which she did. But then another one called me and said that wasn't one of you who had called me earlier on. So my question is how did she know all my information because she did a security check with all my personal details. She spoke to me nicely and we agreed on payment option. But this other last agent did not do she only threatened to submit my account to your collectors.

I need answers if this first agent who called me today and yesterday wasn't from Tracker how did she have all my information.

I also want my account closed because now i don't feel safe.