Modem Not Connecting

Took a 2gig contract for 12 months, they sent me a modem that does not connect most of the time. 2 weeks back it stopped working, sent they an email. They rep**** with a Ref No. *** then *** then *** but still no help. Instead of getting a call from their Technical dept to sort this out I get a call from Sales Dept trying to sell me another broken Modem. I did make it clear to them that I used the Modem for business, since 26 March I have no connection. Plus their data is not carried over to the following month. I will never use Mweb ever again and I will make sure I tell anyone and everyone who cares to listen. We are tired of BAD service