Vodacom router, poor connection - ignored on emails

I ordered a vodacom router early this year, a consultant called me and because I work online, I needed a speed of 20 download and 10 upload. The consultant assured me that those requirements were met. Upon delivery router barely had network and did not meet my speed requirements. I've tried returning the router to my local vodacom storr, unfortunately they couldn't assist because this was an online order, I've wrote several emails to vodacom and I've been ignored. I'm now on credit bureaus because of a router that doesn't work and I cannot pay for something that I do not use.