Telkom agents does not inform you of crucial information when doing your upgrade

I went for my upgrade a month prior to my contract expiring. After choosing the new cellphone contract the agent told me they do not have the phone in stock. Which was fine. I sat there for a bit while he was ordering the phone on his PC. After awhile I was asked to sign the electronic thing, no explanation what I am signing and I left. I am still waiting for my phone, I received an sms saying I will be billed twice...I do not understand how this was not communicated to me while I was there. Terrible service. Now I dont know when I will receive my phone and why pay for a product I have not yet received? Will I get the data for my current contract and the new contract or how does this work?