Sky high billing and documents are gone

My husband and I went to vodacom to change my contract from my mothers account to his account! So we filled in all the forms and spent 2 hours there sorting it out! I also upgraded to a new contract that day! A month later my mother received her monthly bill and had a great shock! She realised my account was still being charged to her and that my bill was over R4500. I went to the Vodashop where my upgrade was done and enquired about the high bill. I soon realised that Vodacom had never set up my contract as requested initially, and I was therefore charged out-of-bundle rates. The staff member assisted me to change my contract to \cut off"when my data has been reached (we requested this initially on the 15th of March as well but never done). I then asked the staff member why my account had not been changed to my husband's account. He could not find our Fica documents (personal documents) any more. I would like to know where all our personal documents are because this makes me scared and very upset. Why does your staff lie about contracts to trick the clients! Very upset and disappointed!!!!!"""