We've never had this much

We've never had this much trouble with an agent before in our lives. We had several viewings and they were always very kind. However, they only opened the door for the back entrance. Upon moving in, we discovered that this was because the front entrance wouldn't shut properly, the beginning of a long list of issues. Our move in date was the 6th of September. Previously, any rental property we'd moved into had been cleaned. This was clearly not the case here. Our first impression of the house when we arrived on 6th September was the smell – we (along with friends and family who helped us move) felt that the house smelt very strongly of something resembling cat urine. As we viewed the house, it felt like we were in a horror film. They allowed us to move into a smelly, dirty property with a young family and my wife broke down in tears when we were looking at the state of the house. We complained at 1pm on our moving day and it was completely ignored. We're having to share a set of keys and have no access to the French doors. The old tenants property is still littered around, as well as their lingering smells, dirt and even their underwear. We feel utterly mortified by everything that's happened and feel completely misled. We wish we'd never moved.