I feel like I was constantly being overcharged by ...

I feel like I was constantly being overcharged by SMP. The last time I went there, I got a diagnosis for my oil leak (costing me $80), and they then told me it was going to be $745 of labour for a $30 part. They said it would take 4-5 hours to replace, causing the cost to be so high. I called around to other shops, and all of them told me the time to replace this part should take less than 2 hours. I ended up getting this part replaced at a different shop, and it took them 1.5 hours and costed me $189. I am very done being overcharged by SMP.