buy a bag of sand and cement and fill it yourself , if your soffit and facia boards are not rotten then give them a good sand bak and some quality paint such as dulux weathershield, but if its rotten make sure you cut the rotten wood out and replace or remove all and replace with pvc, Don't just cover up with pvc as if its rotten as it could travel to your roof joists in time and cause a hole new problem.