I purchased a set of 4 Cooper tires due to a $70.00 gift I was to receive. I received it fine, I looked at it and it reads " funds do not expire" even though there is an expiration date., I put it away til I decided what I would use it on, I went to use it and was declined, went online to complain, and did not realize I needed to register it, however... it would not let me register due to the expiration date. It did let me check funds and to my surprise it had only $54.20.. even though I had not registered it. Please explain, first.. why it expired yet states funds do not expire, second, ... how can it no longer be worth $70.00 when I did not register, therefore could not use it.