My sister entered a competition for $1000.00 prize. The salesman contacted her with regards to demonstrating goods. She said she was not interested. They did this two more times (3 in total), before she agreed in order to stop them from calling. When they came for what she thought was just going to be a demo they managed to convince her to buy $4000.00 vacuum cleaner (she has no means to pay this off even with monthly payments and currently has defaulted on existing loan a number of times, they did not ask her about the value of existing loan or its payments. She spoke to a friend and realised she had been duped. She contacted the sales people to cancel the contract within the cooling off period (10 days). They didn't accept her cancellation over the phone, but instead sent out their manager who convinced her to remove some attachments and extend the term by making her feel guilty about cancelling. My sister suffers from bipolar and has been made extremely depressed since this has occurred. My questions are: 1 - Does the three calls to make her allow them to come into her house constitute harassment? She definitely felt it was the only way to make them stop. 2 - When the manager changed the terms of her contract within the cooling off period and had her sign the new agreements with the original date. Is this legal under contract law or Australian Consumer Law?