Excessive charges on Vodacom Contract account

As a Red VIP client i am so disgusted in the service that we have received so far after being a vodacom customer (my husband since 1994) and myself for many years. Yesterday morning as normal me and my husband received the balance of our account via sms.My account had no problem normal as always.With the shock my husband came to me with his sms that he received ,which says his account balance is R32682.92.The day before his account was on R4770.15.Yesterday he contacted vodacom to clear up this issue for there is no way that while he was asleep the account could skyrocket like this.They said they will get back to him which they never did and then later in the afternoon he contacted them again to follow up and still had no response.Later yesterday afternoon we both received an sms stating that Balance has now been exceeded and the line is softlocked.Which first of all why do they lock my number if my account was perfect and did not have the issue.We constantly on our wifi at home so there is no way we using this amount of data.This morning we woke up with an sms stating that the account is standing at R72280.43.We then drove to our closest vodacom shop and all that they could do was to log an query for investigation which can take up to 2 to 4 working days. How can his account while they blocked our numbers still went up from R32682.92 to R72280.43 in a matter of a night.Not even.All our mobile data are switched off and we using our wifi at home mostly and thank goodness our wifi is not through Vodacom for that would've been blocked too. Very disappointed in the service and will be canceling our contracts once they come up for renewal.And for this matter we will seek legal advice for we won't pay this amount which was not created by us.