Overdebiting my account twice

I took a wifi router from mobius. In the beginning of march 2016 and the contract was for R59 now end of march 2016 they debit my acc for R850 last month and this month same and also R950. i would like mobius to contact me asap and find out wat on earth is going on...... U guys leave me no choice but to reverse both the debit orders and i have had absolutely no feedback from any of ur customer service..... I want to cancel this contract due to the fact that you have falsely advertised your amounts and i have got no joy in this matter to resolve this issue........ Pending ur call back!!!!!!!!!! Pls just cancel the contract u have to cancel it or u can report it to the higher authorities