Myiweb please don't sign up with them for internet

I signed up with Myiweb last year. They then came to install which was fine and informed that I pay R1800 for the 10/10 line which could be split within three months in the three months nothing was deducted. Thereafter the three months they deducted the R1800 which was OK, but then the following month again R 1800. I then called the centre and they informed me that nothing came off by debit order I then requested the lady to give me her email address which I have in my inbox and sent her my bank statement showing the R1800 came off. Nothing was then said to me via sms or call. Since this whole query with myiweb no debit orders came off which is not my responsibility to followup as to when they debiting my account but then out of the blue after three months they debit then not debit which became a norm. Anyway fast forward to currently I get an sms stating that I am going to be blacklisted and have to pay an amount of R4800. 00 now again no calls/sms stating that I never paid really is this the only way you get money out of your clients if so then I would suggest no one signs up with Myiweb please do not fall for their games rather go with another service provider that can provide a better service and know there lane.