Incorrect device delivered trick to enter customers into higher deals

In May i ordered a p20 lite from telkom on the 1gb free me deal. I waited 2 weeks for my phone to be delivered while in the interim telkom debited my account for the R269 cost of the deal. Whenmy phone was finally delivered it was the wrong phone and incorrect free me package. I waited for telkom to vonyact me about the error but nothing. Now i get a crazy invoice of R2500 for the phone and contract without any warning or contact from telkom. How do they expect me to pay for a contract i didnt enter into. At seeking assistance i was told i had a 7 day coolomg off period but this is not the contract I entered into with telkom.