The horrific ordeal was narrated by Shahbaz himself in his first interviews after he recently returned home in March from the clutches of the Islamic Movement of Uzbekistan (IMU) and later the Afghan Taliban.
"They used to flog me. I was flogged about 500 in three days, then they cut my back with blades and removed nails from my hands and feet," the 33-year-old told BBC Urdu about his captivity by the IMU, an outfit long associated with Al-Qaeda blamed for high-profile terror attacks in Pakistan including the 2014 storming of Karachi airport.
Once the captors also stitched his mouth.
"They used to torture me for making films and used to tell me their plans in advance. Like they would tell me that they will remove my nails tomorrow.
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"I used to pray the whole night," Shahbaz said.
"They would carve my back open with blades and throw salt. They sewed my mouth shut and starved me for a week. They shot me in my leg. They cut flesh off my back. I bled for seven days and they wouldn't give me any help for seven days," he told CNN in a separate interview.
He also said that differences cropped up between IMU - whom he described as known in militant circles for being "ruthless, merciless and the best fighters" - and Taliban over the issue of allegiance with the Islamic State (ISIS) group.
"Following the dispute, Afghan Taliban attacked the Uzbeks and eliminated their whole group - their leadership. For three days, only death lived there," he said.
"People, friends and family say you are very brave, you came back, it was very heroic. But these are not things I can say about myself. What I can say about myself is that I learnt to be very patient.
"You can take the miracle how you want," he said, and
describes himself as "walking back from the dead to celebrate my father."
"You forget the faces of the people you love," Shahbaz said, "and then suddenly you have your life back. It's such an amazing feeling. To see my wife, To have breakfast with my mother, drive with my brother or to watch a football game with friends."
Just 10 days before Shahbaz was recovered, Qadri was hanged on February 29 at Adiala Jail Rawalpindi after President Mamnoon Hussain rejected his mercy plea.
Shahbaz said his new captors, the Taliban were not interested in a ransom but instead "sentenced" him to further jail time, before he "met someone there who helped release me."
He said he had been sentenced and jailed for two years, but his fortunes took an unexpected turn when he was freed by a member of the Afghan Taliban.
He said that he trekked from the central Afghan province of Uruzgan to the outskirts of southwestern Pakistan town of Kuchlak in Quetta, where he was able to call up his mother following which he was recovered by security forces.
Sporting long hair and a straggly beard, Shahbaz was unrecognisable, suspected of being a member of the Afghan Taliban himself. He was refused help and then serendipitously was pitied by an actual Afghan Taliban who offered him his phone.
"It came out of the blue and with such urgency, I couldn't believe it!" his mother Aamna Taseer said as she praised her brave son.
"The wait was finally over," she said.