PURCHASE IN SINGAPORE OF SANYO CAMRECORDER VPC-CG 100

On Monday the 13th June we had some fortunate dealings with the following retailer.
On the 13th of June I became unwell and had to seek assistance in the above premises. I was later taken to hospital and hospitalized for the next 3 days. At first he was quite helpful but as time progressed he started to exert pressure for us to buy a video camera which at the time we did not attend to purchase. We also feel that in hindsight he exploited the situation
Although he was aware of my state he continued to press us to purchase a camrecorder Sanyo Xacti VPC-CG10P which he claimed was worth over $2000.00 but subsequently reduced to $450.00 with accessories.
In order to vacate the shop my partner purchased the Video camera.
When he was asked for a receipt he provided one but if failed to comply with the requirements for the redemption of the sales tax paid and further he did not provide the correct redemption forms.
I was released from hospital and provided with a permit to fly home and flew out on Thursday night.
On arrival in Australia we were first able to look at the camera when it was found that the camera was not the VPC-10P model we purchased but a superseded unit VPC-CG10.
We are willing to keep the Camera provided that a reasonable price is negotiated and the difference between the two units is refunded.
Subsequent enquiries in Australia has found that the retail price of the VPC-CG10 is in the vicinity of $A 100.00
Could you please advise if there is any action that I may be able to take or can you instigate proceedings to have this matter rectified?
My Address is as follows:-
John Parsons
Unit 2/1 Gatis Street
Glen Iris
Victoria Australia 3146
Phone +61412362634