If you do not want to avail their service, avoid subscribing to them. If you did not subscribe, then no load will be deducted automatically from you.
However, if you've just subscribe and wanted to Unsubscribe from this, the only way to do so is to follow the step/s below:
1. Just Type this keyword "STOP ALL" then send to the number you are currently subscribe. For ex: STOP ALL send to 2363. Then wait until you've receive the notification fro the number that you've cancelled the subscriptions from them. See screenshot below: