Say goodbye to your hard earned money

Annoyed beyond myself dealing with this company. I had a contract that expired in September. I received the invoice on the 12th of October. They changed the billing amount from R280 to R630, for which I never received any notification, so I phoned them and migrated to a different contract of R213 per month. I asked the lady that was dealing with my call if I will be paying the R630, she said no, only R213. I asked her if she is sure, "yes sir, you will only pay R213". Come the debit order date (today 27 Oct) R630 was deducted. I spoke to 7 people to try and recover my money, but "unfortunately I phoned after the billing cycle ended", the 12 of October, the same day I got my invoice, so I cannot be refunded. So essentially they can charge you as much as they like without prior notice and all they can do is tell you that they're "sorry for the inconvenience". If I knew they would eat my money like this I would have never opened a new contract with them.