Vodacom Poor service with Contract repayment and finalisation of Accounts.

We immigrated in April to the UK and I requested several quotations on ALL my Vodacom accounts and got two separate quotes and a third letter stating that my final balance to close ALL my contracts would amount to R10 000 altogether. I paid the R10 000 on the 18th of August already and after that I was told that it would take a few days so consolidate my account. Then by the end of August Vodacom tried to deduct R4500 from my bank account which luckily there was not that funds in the account available as all my money is in the UK now. So I was penalized with R110 bank fine for the debit order not going through. I immidiately then emailed customer care and asked what was going on as I did pay the amount as quoted by them on two seperate occations to clear my accounts with them and close is as I won't be using it again. They rep**** on the 28th and said that the query would take two working days to be resolved and only two numbers were converted and the other two they still need to convert. I did not hear anything further and on the 8th of September I received a statement and invoice where I can see the two numbers were converted but it still shows the R4500 and I am not paying another dime to them as I requested a quote TWICE and received a letter of demand from them for the R10 000, which I did pay. I send a mail again on the 24th of September and NO reply and you can just guessed what went of my bank account yesterday??! Another attempt at R4500?? Again no money in that account so it is another R110 banking fees for Vodacom's mistakes and I am FED UP with them now. I did the honest thing and asked to pay them the remainder of ALL my contracts and now I feel that they are *****ing me over by adding amounts and I am not going to pay for their incompetancy!! I worked on a written quote the gave me and according to my knowledge I am finished with Vodacom. I don't know what else to do to get them to finalise my accounts and NOT keep trying to deduct money from my bank account!!!!