Cameron Dalziel's wife Reine has since cancelled her husband's credit cards upon noticing activity in his account, her brother told CNN.
Cameron was a South African travelling on a British passport, who had moved with his wife and two children to Malaysia recently.
The report said that the "heartless" rebels, who allegedly shot the plane down, had been using victims' credit cards, answering their phones and looting their belongings, including jewellery, from the crash site.
Reine's brother, Shane Hattingh, told CNN that, "People are abusing it in the Ukraine. They have no respect for each other, look what they're doing. It's no surprise that they were treating the remains of people like that. It made me angry beyond words".
This only added weight to reports that the pro-Russian rebels have looted the MH17 crash site to sabotage the investigation into the disaster and to cash in on it, the Daily Mail reported.
It was previously reported that relatives of victims of the crash had called their mobile phones only to have them picked up by people with "eastern European-sounding voices".
They then proceeded to instruct the mobile phone companies to shut down the accounts.
Comment: It's worth noting the reports of stolen cell phones and credit cards being used only came days after Kiev forces had access to the victims belongings, not before.