Struggle to cancel wasp service

We have a contract for each person in our home. All phone contract's is on my husband's name. A week and half ago my husband discovered his airtime disappearing bit by bit every day. He sent the stop wasp services sms. He left for his offs**** job on Monday 8 January and still every day when we check there is about a R5-00 that is missing and everyday its another R5 less on his airtime. He send me an email to call Vodacom to make sure they cancel it because the airtime still disappear. I tried 5 Vodacom shops, and tried the call centre a few times. They wont help because the contract is in my husband's name and they have to speak to him. If he could call himself he would and not ask me to. They cannot make calls and even if he put mobile data on his phone on he cannot use the phone. It just shows no network connection. A call centre agent told me this morning he must cancel using *111# option but I doesn't help because the phone have no mobile connection and its doesnt' help. He will only return to South Africa in 3 months and by that time all his airtime will be gone. He also went on the Vodacom website to try and get a email to cancel it but there is nothing. I cannot believe that Vodacom cannot even help with something so stupid like cancellation of a subscription to something that takes our money and we didn't even subscribe to..