Cheaper service to cost implications

I am very disappointed ☹️ above the service I had with green point car car clinic. Their service is poor!!! Firstly, when I collect my car after service they told me that interior lights will not function due to faulty sensors. I asked the guy what he meant about that? He just mumbled and I switched on the lights and we fought about that silly comment. After a month my is misfiring and loses power on acceleration and I went for the second opinion. I found out that “spark plugs were due for replacement “ While I sent my care couple of weeks for service with Car care clinic. Watch out guys they might be cheaper but it comes with cost implications