cancelation of airtime

<p>I called rmcs several time asking them to cancell my airtime contract but they failed to do so now im strugling to block my ****** cellphone as vodacom told me to call rmcs as i have a contract with rmsc still they told me that they will get back to me till today m still waiting their call or must i close my jet account so they will stop sending an airtime</p> <p> </p>