Hi Pingin. I'd say you would definitely be within your rights to get it rectified.
It sounds like a major safety issue. There was deaths in the USA from unintended acceleration from faulty throttles.
I had issues with the electronic accelerator pedal on my current car but it's a long time out warranty.
Not unintended acceleration but unintended entry into Limp mode which can be a bit of a nuisance too. And a safety issue too.
I was able to solve it in the end by disassembly of the potentiamoter, giving it a good clean with electric contact cleaner and cotton buds, reassembly and adjustment to resistance values found on the Internet.