Pathetic MTN internet service

We left Telkom almost two years ago as our internet provider due to absolutely pathetic almost non-existent service. We regrettably decided on MTN, signed a contract with them and received a wireless ZTE modem/touter with a MTN sim card which sticks in from the side. We have just had sh** from day one. The Internet connection is off a few times each and every day. Sometimes (when working) running okay, but mostly slow and intermittent connectivity. It is actually useless and no good as it is. Can`t wait for the contract to expire to change over to a decent internet service provider..