Lets try to get the story line together:
"he was targeted by a local gang who spiked his drink."
"Carl said he had just secured accommodation in Pa Tong"
"Carl found himself in a two-day frenzied delirium after allegedly having his drink spiked."
"More than 48 hours later, Carl returned to a normal state ... He used the shop names to retrace his steps to his original accommodation."
"when he tried to confront the muggers -....."
"When he arrived he ended up being met by cops, who threw him into a police van "
"During the drive, Carl said four police with metal poles beat him, ...He said: "I thought I could take it, ..... At that point, I stopped resisting"
""I found a lighter, which I used to light some rubbish on fire"
Guy goes for a drink, says he got drugged. After 48 hours feeling better, goes to his original accommodation (where was he during the 48 hours?) sees he got robbed.
Goes to confront the muggers, meets police with metal poles (they use them to control people who are not acting normal), resists arrest (arrest what for?). Gets into a jail cell and sets it on fire. Gets beaten up again.