Breach of contact a

Good morning

I am having A problem about a company called mobius, I have signed a contract with them online of WI-FI we had an agreement that I pay R80.00 every month. but they did not do as we agreed they deduct R280cent everymonth and it stop working after 2months but they still continue to deducting the amount of R280cent wich we didn't agree on, Please help me Regarding the problem

Thanks: