MRP mobile overcharging on contract phone

<p>Took out a R99 per month phone contract with MRP MOBILE almost 2 years ago. Today I received a SMS stating that R369 was debited from my account by MRP mobile and upon further investigation found out that they have been over charging me almost every month since I got the phone. Can't seem to get through to them via phone call and have not received any reply to any of my emails. I also have not received a single monthly statement\invoice since opening the contract. This is unacceptable and I would like to have this rectified and have the contract cancelled.</p>