Rain is pouring our money down the drain

Rain 4g network. They are deducting several times a month from my sisters bank account without her authorisation, fof my rain account. My sister did an eft from her account one month, om behalf of me, and few days later they deducted same amount from her bank account, twice, on the same day. She did not authorise this. Today they were trying to do the same. Not sure why, i arranged for an eft on 25th of each month. Seems they have 2 payment days in the same month, on their side. Please let them pay my sisters money back, immediately. My rain acc is for peter barends, id . *** made arrangement for an eft on the 25th of each month