Rip-off

I was with auto and general almost a year, I moved to Johannesburg and emailed them about my relocation I receive an email that my insurance will be 2000 premium as from July without any explanation but as we all know you change location it affects your insurance but I think I deserved and explanation as in why my premium increased almost by 700. I emailed them, then a lady called me, at the end of the phone call my premium was 2800 premium with no days or monthly notice( I guess their custom always have extra cash). I call in the next day to cancel it since I can not afford that much, and I find out that they will debit R500 the next day since my police is amended or they cancel the policy. I said but I have already paid you for July since your amendments come after payment (ask if they cancel they gave back my money for July) and I ask why since the email said the changes will be effective next month. I was told I am not the lady who made this changes so I do not know what you two agreed on, but the gentlemen said he understands and he will cancel the debit so it doesn't go through on 9/07/2015and also cancel the police as from 31 July mid-night. today to my surprise my R500 dbtd