Such a disappointment and inconvenience from a telkom

I took a fixed contract of R550 February 2020 from Telkom, I was advised by my consultant that on my first debit order I would be charged double the amount and some other fees which totalled to R1200 and going forward from there it will be R550. 00 if I exceed my bundle or airtime I would be cut off until I m reactivated for the new month of which I was okay with. But now my billings from month to month are in consisted which is not what I agreed to, sometimes it's R500, at times it's R750. 00 the last straw was June 2020 where I got charged R1581. 13. Which I never budget for and such an inconvenience. I need my account to be investigated reconsilled and be refunded what is due to me. Or else I am more than happy to close off this account if I am going to be living like this from month to month. And to try to get hold of telkom is another nightmare of it's own never mind the emails I sent that I'm still waiting for response. I have never ever been so inconvenienced by a service provider in my life.