Ticking sound on drivers side

Had a shop change timing and water pump they also did valve work on four valves on drivers side due to valves being bent after botched timing and water pump replacement. No errors displayed in dash after fix. But Now it makes a ticking fluttering noise. Sort of like when a lifter is stuck. Sounds like diesel engine. It diminishes after it gets warmed up but its not as loud as a cold start. Vehicle runs well yet I am worried about sound I feel valve job was done wrong or maybe a worse situation. I have not noticed any loss of power while driving, does not overheat, does not generate engine error lights. Can I still drive it? I am also worried it may be a rod knocking but sound comes from top drivers side and quiets down after driving and warming up. I am taking it back to the shop that did the work for the third time. I am so disappointed I feel they do not want to honor their work. Aside from small claims what can I do? Also, what is the problem any ideas? Any help will be will appreciated in helping narrowing down the problem.