B & S Tire & Service

I purchased a brand new axel the beginning of february, two weeks later my car was shaking again so I went to a tire shop and he said I had a bad tire. After the tire was switched the shaking was worst than before. so I took my car to my friends shop so he could check it for free because I was low on funds. my friend told me that I needed a new axel and I told him I just purchased one from good year. He told me to take it right back to them and get a new one A.S.A.P because my commute to work is far and if it breaks it can cause other damages. Also I purchased 3 new coils and they only replaced one. my mechanic told me thats why my car was shaking and he then showed me that 5 out of the 6 coils were (oem) meaning original parts and only one of them where changed and he noticed because it was an aftermarket part. please help me rectify this situation.