*****ing my money every month

This is my second contract with telkom. The first time I had a contract and I kept buying too much data and increasing spend limit. So I went to a consultant and requested a fixed spend limit so I cannot increase and cannot exceed and end up paying alot. The consultant does not inform me that I will have a spend limit of R5000 she does not inform me that of I go over my monthly amount that my bill will dig into the R5000. My intention and I told her this was to pay less and limit myself. But she didn't think it made sense to decrease my spend limit for 3 months later unaware of the bill going up. I end up paying up to over R800 a month. So I need to upgrade my contract. My friend tells me take a other agent. Etc he met another agent blah blah. I go to her. After 2 months of struggling to decide to stay with Telkom. I explain I want a fixed amount she explains to set my limit to R1. Etc. Then I tell her on the day to add insurance. I then decided on the exact same day that insurance is too expensive. So I cancel on same day. So Telkom is telling me they can take my money and book insurance but they can't cancel it immediately. Cause they a company about taking extra money about clients constantly. Also I do an early upgrade. No one tells me that last month I will be billed R1500 to finish the last contract. It's like do they even communicate it must we get money surprises all the time... I want my money back and I think this company should be reviewed. Cause 1 mistake is okay but 3 mistakes and I changed consultants. It's a company thing then hey.