Vodacom LTE false claim

Bought a data card for LTE on 11 November backed by the assurance this would have a speed of 10mbps in our residential area. To date have not achieved 1mbps, logged numerous queries in their customer care e mail and only response I get when querying is that it has been escalated to their network department and they will respond in 72 hours which is not happening. Tried contacting them on 082135 and this is even more useless, after holding on for ever yo get transferred back to the beginning without even speaking to a "consultant". Can't get them to cancel this contract or get to speak to a person to escalate this.