Vodacom is a **** ..

I have 3 cellphone contracts with Vodacom. My fiancé uses one of these phone contracts. She has received a phonecall from a Vodacom call centre agent telling her that because she doesn't use her night data , they are going to offer her a package where she will receive only anytime data and no night data and that her monthly installments will be reduced. She rep**** by saying that she is not the account holder and that she will get the account holder (ME) to call back to confirm this... I , as the account holder, did not call back because I was not interested in the deal and I also know that they can not change any details with me giving consent or confirmation... Right ?? .. Wrong !.. This is where it gets really frustrating... I have received an yesterday SMS stating that my Vodacom data package has been changed to a higher data plan and higher monthly installment .. now remember, I have not given any consent to this... I went on to contact 082 135 several times but the BOT is speaking in Afrikaans, no English. Without understanding any Afrikaans, I have contacted Vodacom Phoenix Plaza , who have assisted me to access my account.. they have stated that my preferred language was changed from English to Afrikaans by the call centre agents. Now this is ridiculous, how can Vodacom go ahead with changing ones policy without consent and confirmation from the account holder! I believe that the call centre agents went ahead with this and changed my preferred language to Afrikaans, knowing that I won't be able to contact them to query this.. I have managed to send through a cancellation (reference number : ***) but the store has informed that a refund will not be possible because the data has been received today. This is a **** and totally unprofessional from Vodacom. I've been trying to contact the call centres but it's continuously taking me TOBI (an online bot) who is of no help to me.