Don’t honour guarantee and 3 years in, parts are breaking

We had a pool installed in December 2019. We were given a two year guarantee but during the first year all the paving around the pool cracked and disintegrated. I contacted the company and they said the company had been sold and that the pavers were not included in the guarantee and they had since started using different paving slabs. They refused to honour the guarantee for the pavers. The piping used to solar heat the pool have now cracked and started leaking badly 3 years later. We have also had to replace the pool pump earlier this year. That’s just 3 years in , and it’s not looking good.