Account on Areas but it was not working

Bought my router staying in Cape Town it was working fine , i then moved to EC and it didnt work , told them it was not working and they say its been working so hence they are charging me. The worst thing is they have been billing me for 0 usage . My frustration is ive been calling their line which only went through once , they called and hung up .i have all these invoices which says 0 usage because this was not working and i reported it .