Deduct extra money via Debit Order

I upgraded to the explorer for R 899.00 per month in March 2106. Call was made to them that explorer were installed and therefor the new tariffs applicable. End of March Multichoice debit my bank account with R 1350.00 I called *** twice on 30 March 2016. The fist person I did not get the name properly, but the 2 time I spoke to Mathilda at 11h40. She informed that the LLP of LPP department will contact me with 24 hour. I waited a couple of days without anyone contacting me. I then on the 07th April I lodge a written complain on there social media page. Got a email response to saying that they are commited to resolve my complaint , expect response within 24 hours. I still had not one contacted me or sent any form of response. Enquiry Reference Number :<br> *** . I dont know what to do next ? Please help as they have not right to do this......