We used a care agency for my mum before she went into her care home. We had no complaints about the agency, it was a local franchise for a national company. The manager was very helpful when we first approached them, taking time to explain things and advise us. The carers formed a small team of three ladies who were the only ones who visited mum, each was was personally introduced to mum before they started. They arrived on time and did the full hours, we had security cameras outside the house and in the lounge and kitchen so could see everything - obviously the agency were aware!
They used a Whatsapp group as a daily record and means of communication, we could add a comment and the carers wrote something every visit, management read the posts as well. The work for mum was easy, although she had Alzheimer's, the plan was for them to spend two hours there each visit to cook a hot meal, sit with mum while she ate and provide company. Sometimes they went for a short walk or did some chair exercises or pottered in the garden or even sang songs together.
I would recommend this agency to anyone.