MRPmobile service Suck and comitting ***** by deducting money for service that was supposed to be canseld

I have requested my contract to be canceled Last year May 2018, for more than a year they keep on deducting the payment. I have send numerous e-mails phoned several times over and over I phoned on Monday 2 Dec'19 send 6 e-mails to all the mail address and on Thursday 5 Dec'19 AGAIN they had no record of me phoning or sending e-mails HOW can I canceled this data contract that I am not using for more than 2 years? Every time I requested to speak to the person helping me He/She died or left or went missing. I am so sick and tired of this for months it's been going on that I just don't get them to cancel this data contract