*****ing Money by Debit Order Errors and ********** service

I have app**** for an SME and Corporate account online and till today no service nor Manager assigned to my account, but every month debit orders fly through to my account and when i query them there is no one to attend to me. Now when i tell them i would like to cancel this account they threaten me with hefty early cancellation fees. I am being held hostage by these monsters. Last week they told me that there were errors and i have a credit of more than thousand rands but still they tried to debit my account again and i am still waiting for them to explain a long list of statements that doesn't make sense to me. first they never assign a contact for you then confuse you with statement and then hit you with very high bill. Today also i am stuck out of the country, tried to buy airtime online and money went off but they never credited my airtime. had called the call center for more than 30mins and i have to pay for that roaming charges and they told me my Cellphone account is in Arreas. when i question the bill they also tell me there has been some error with regards to billing on October for R300 and they don't know why. Whether is corporate or Personal lines Vodacom doesn't care, all Poor service and hefty bill. Now if i want to cancel contracts i pay the price again for recieveing poor service...What should i do? Wish i had known,