Vodacom acting like they do not have airtime

I took a contract with Vodacom via Elite Mobile in less than 2months ago and I am already on Hellopeter about their horrible service for the second time. I received an sms saying that I should contact them with regards to my debit order details update. According to me I have given them the correct details to debit the R89 that needs to be debited monthly. If they feel that the details are not correct, why dont they call me tell me or confirm with me like they did when they were busy calling me every week selling this device to me??? This morning I receive an sms saying that my account is in arrears with R108.49 I must pay the full amount to avoid extra charges...What makes up this R108.49 coz I have taken a R89.00 contract???Like really now, my husband has been with Vodacom for the past 10years but I really believe the next contract expiry. We must just leave Vodacom alone with their Very Bad Service.