Not prepared to process claim

When I called the call centre this morning, and explained that my windscreen needed to be replaced, they questioned me regarding the date of the incident. The original crack occurred late last year, but was a small crack that did not obscure my vision at the time, so I did not claim. However, subsequently, the crack has expanded due to the excessive heat that we have been experiencing, and is now resulting in my vision being obscured. They now claim that due to the fact the original crack occurred last year, they will not replace the windscreen as it is an old incident