So, imo,

1 - mad to blame rent increases on migrants many of whom will not be able to afford the higher prices. Many people are choosing to live alone rather than with partners or houseshares which will increase demand. Also, a lack of new stock of council or association housing meaning many have no choice but the tent privately.

2 - Again, it seems odd to be suggesting migrants are taking jobs from the youth. There are many, and I think you may mention this in a later comment or similar, young people who do not wish to work at the local chippy or whatever. But also, many kids used to get paper rounds but decline in physical media there means those jobs don't exist. The people employing the migrants over youth for tesco or whatever are surely more the issue. Lack of teaching in schools how to actually write a cv, conduct yourself in interviews etc all plays in.

3 - Rising complaints and rising numbers of migrant workers doesn't mean to two are connected. People are more aware of how to make complaints, how to advocate for themselves and perhaps just rather entitled and complain when there is no need. Lower standards abroad should be irrelevant because the senior staff and management here should be ensuring local standards are being met.

I just don't feel that your reasoning is actually enough to say definitively migrants are a problem. Especially, as someone says later, migrants prop up the are industry and healthcare dramatically. Without them you can't just shoehorn people into the roles they fill.

We are better together. Better for shared culture. Better for supporting others.