Is there any other way for oil to get into the coils of a Refrigerator?

We purchased a NEW fridge from Sears in 2002 and purchased an EXTRA 3
yr In-Home Master Protection Agreement at that time. It made alot of
noises from day one...the 1st compressor went out in January
2004....the compressor was replaced...the service man told us that
either the compressor's must be bad or something...he was replacing
them right & left. After about a week...the noises got worse....we
lived with it. It was about time for our 3 yr agreement to run out so
we purchased ANOTHER 2 yr In-Home Master Protection Agreement.
Then on November 13th 2005...all of our food in the freezer thawed out.
We unplugged it for fear of a fire. When I called the 1-800 #...I told
them I wanted a replacement.....afterall, what is that "Satisfaction
Guarantee" worth anyway...they told me it was up to the repairman. The
repairman came and plugged it back in....it came on and was working
fine, at that time. So, he wrote on the service order paper, "working
properly at this time"....and could not determine what was wrong. He
told us to put a bowl of water in the freezer and "watch it". This
could be days, weeks, or months and was told they could NOT do anything
about it for now. Then, on November 18th it qujt working
again...serviceman came on the 19th....he said he found oil in the
coils and said we had turned it over or dropped it.....NO WE DIDN'T!!!
They won't fix it OR replace it.....

Does anyone have any suggestions??????

Thanks in advance,
JasmynJade