VODACOM SURELY IS NOT INTERESTED TO GET PAID!!

My cellphone and my son cellphone is going off my credit card monthly. I received a sms from Vodacom that I must update my credit card details at [URL Removed] or phone them on 082111. I tried to do it online, but you do not get the option to change bank details. I tried for 45 minutes speaking to 2 persons to give my new banking details which they could not take down. They could not even help me where to find the place to change it online! I visited the Vodashop in Malmesbury (which is very helfpfull) and they also phoned numerously whilst I was sitting there for 40 minutes and they were also not succesfull. They were put through from the one person to the other. Well, it seems that Vodacom is not interested to receive their money. If they want payment the end of the month, they can contact me. They must dare to cut my service!! My acc is on the name of my husband (which is currently abroad) but I am paying with MY credit card and I only wanted to give my new credit card details. I cannot see what the problem is, as I do not want something from them! I want to pay!!!