Inefficient, dont return calls

Obakeng Lekgeo is the sales person that sold me a wifi router on 29 september saying i have reception where i live. I cancelled the contract with him 11 november as it never worked. Item collected 12 november. Said i refuse to pay pro rata for the router as i never had internet! I am happy to pay for data used. Passed it on to accounts who said the will research. Called them a few times more due to not having a response and the money was debited from my account! Then they said that account was never cancelled and the router was never collected but i sent them proof!!! Have spoken to Mmamy (who was very helpful and efficient but she hasnt called me back in 2 days after leaving numerous messages and sending emails. The supervisor Edward was also great but NOTHING has been done!!!!! And now they debited my account AGAIN end of december. NOBODY is getting back to me!!! They keep playing pass the buck and sending this to other departments who never get back to me. Have already used social media to complain, sent emails to every email address they have on their website, messages them on facebook and dont know what else to do anymore!!!!!