Telkom ******** a person with incorrect sales offers

Took a contract for R605 a month and was told the 1st month is free. Got my 1st statement reflecting that there is no payment due. Now I got my 2nd statement and now I have to pay double. Called the admin line - the managers are busy (I worked in a call centre and know the managers are to lazy to take a call. I have tried to sort this issue out but the accounts department says I must call the sales dept - I did and the sales dept says I must call the admin dept. This needs to be sorted out as I am only going to pay R605 as per the agreement ***