I understand I cannot legally require them to respond, unless the notice specifically requires it, like for instance, a notice of entry, but it's making it difficult to manage the property, and I'm not sure how to proceed.

I am curious to learn how these operations are managed from abroad.From what I've seen, it's 100% possible to invest in real estate in the United States remotely.

A small multifamily property is a smart choice for a first investment—it offers a great balance of income potential and manageable scale for someone new to the space.Don’t worry about being ambitious; it’s clear you’ve done your homework, and you’re already ahead of the game by setting a clear goal.

As you suggest lowering down payment to buy more properties is one way, although the downside is greater risk in event of down cycle and more time to manage required.  

Let's you prove yourself to your investors in a more manageable way.  

However, like most property managers, once in awhile they do have investors interested in selling and at that point, they may reach out to their clients about that sale. 

A duplex strategy is a low-risk entry, saving on living expenses.

I asked for a refund outside the 3 days (ridiculous time frame to give to clients but it tells you everything you need to know about the company just didn't realise on time) but I told them I didn't receive the login until the 4th day and that I am the one who requested so I would still be missing the login of wasn't for me that didn't seem to make sense to Kevin the manager there who by the way called me a week later.

I have some flexibility but rely heavily on my team for admin work and the day-to-day operations of property management.

Even if a title company were to manage the setup making sure all parties are paid, the cheap debt and cash flow would not be enough to be enticing to any investor even if midterm rental could yield a healthy return.