*****lent charges on account

My retired mum has had a account with Vodacom for more than 10 years. Earlier this year, Vodacom provided a third party a new contract on my mothers account completely unbeknown to her. When she noticed the higher billing charges she contacted Vodacom immediately, who admitted they incorrectly loaded a contract onto her account (she has all the call references). This was done in September this year. The new number was disconnected but then not long after, another number was loaded! In the meantime my poor mums account has been debited with the full amount oustanding including the costs incurred by these new numbers! As of the time of writing this complaint (14 Dec) Vodacom have still not sorted out the problem and continue to bill her with no resolution agreed. I am glad I am personally an MTN customer.