Bitter taste/bad service

I had a car withEarn a Car/Pace. Last year September I asked for a settlement and upon receiving it I said i will wait for 6 months and saved like crazy.. Six months later I requested a settlement again only to be told the amount had been inflated by at least R40k and queired it again. It took over two weeks to get a new amount which was double the amount `i had received in September last year. Long story short I gave notice and cut my losess and returned the vehicle after the notice period. Suddenly the same month I received an invoice so I sent Lerato an email asking what is going on as I had returned the vehicle and have it in writing that I will not be liable for further payments - No response. A few weeks later I get another email threatening me cause I had not paid my vehicle so I sent emails to Lerato and yet again no response to any of my mails. I then sent Maggie an email asking for assistance as she was extremely helpful and next thing I get a mail from Lerato she will investigate. Few days later Lerato sent me an email saying she waiting on the contract to be cancelled and will revert back. Now a month later I am waiting for a response and confirmation that this contract is cancelled. Lerato has not bothered to answer my mails again and once more I have had to revert back to Maggie to try and assist me. This is totally unprofessional and not the way clients should be dealt with. My journey with this company has been so good until September last year and my regret is that I never settled last year and have now had to write off all the money I paid. Of course there is never anyone you can talk to.