Electoripoffapy?

I am currently doing my rural placement and was treating a gentleman in his 80’s as an outpatient for chronic low back pain. He had severe degeneration on X-ray had not found a way to relieve the pain.
On the first occasion I saw him he told me about an ‘electrical therapy device’ that he and his wife had just purchased from a door-to-door salesman for $3600! Apparently the device had a pad that you sit on and a handheld arm that you move along the painful limb. I was shocked that they had purchased a machine for that price because as pensioners they obviously didn’t have a lot of many and good quality TENS machines are only $200-300.
My first reaction to the situation was not to get the man upset without a getting some more information. So I continued to question him and he told me that he had felt pressured by the salesman to purchase the machine and if he had known that his doctors would refer him to physiotherapy he wouldn’t have spent the money on it at all. I told him that I was interested in the machine and asked if he could bring in the instruction manual to the next appointment so I could get an idea of exactly what it claimed to do.
When there was a good opportunity I discussed the situation with my supervisor and we both shared the same concerns about this door-to-door salesman who was preying on pensioners and selling them electrotherapy devices at ridiculous prices. When the man came in next, my supervisor and I asked to talk to him and his wife to determine how to approach the situation and whether to contact the marketing company involved. The man’s wife shed some light on the situation. She had seen an advertisement in the newspaper for the machine and had sent in a coupon requested a free in-house trial. The machine actually turned out to be a cyclic massage machine and they were both adamant that they were now happy with the purchase. I compared the price to other massage machines online and discovered that it did fall within a normal price range. After further discussion with my supervisor we agreed that there was nothing more we could do because they appeared to be happy with the purchase ad no longer had an issue with the methods the salesman used to make his sale.
I found this a really useful learning experience in how to deal with the ethical situations that I might find myself in the future as a fully fledged physiotherapist.