BAD SERVICE

I'm surprised after signing up with MWeb last year...they decided to double debit me for a modem..I have contacted them on several occasions advising them that I'm have Issues with their Fibre it keeps on dropping endlessly. I not even able to attend to my meetings because of the poor connection. Mweb has been billing me R600 and then to my surprise they decided to debit me R1300 ..wow what a surprise. I'm paying for a service that is not rendered . I have endless issues with your Fibre and you guys just debit my account with out informing me that you will be debiting that amount. Please explain to me why I was never informed and why your service is so poor?I will never use your service ever again because of your poor network and dishonesty my agreement was a specific amount and yet you debit whatever suits you...Inger