Constant Oil Leaks and Doubtful Maintenance on My Fiat Egea 1.4

I own a 2020 Fiat Egea 1.4 Fire, and it has been plagued by oil leakage issues. I reached out to Rize Auto AK service for help, and they told me they would perform an oil test and asked me to return for a checkup after 2,000 km. During the initial checkup, they confirmed the oil deficiency and said they needed to replace the piston rings. Despite the car having only 86,000 km on it, I agreed to the repairs, hoping to resolve the oil leakage issue. My car spent 11 days at Rize Auto AK, during which they replaced the pistons, rings, gaskets, and valves. I thought the problem was finally fixed, but to my dismay, the oil issue persisted. After driving 3,800 km since the repairs, I checked the oil level today, and it was low, with the oil appearing pitch black. Once again, I had to return to the service center. They assured me that the new piston rings needed time to settle in, so they topped up the oil and told me not to worry. However, the problem didn't go away. I continued to experience oil loss, and now, at 101,000 km, the engine warning light came on. The service center advised that we must dismantle the engine for a thorough inspection. This ongoing nightmare has not only left me unable to use my car for work but has also severely impacted its resale value. I've even been approached by a potential buyer who discovered that the engine had been tampered with, causing a significant drop in its market value. I'm left in a difficult situation, unable to work properly and facing the prospect of selling the car at a substantial loss. It's clear that Fiat needs to address this issue promptly and appropriately to regain the trust of its customers.