I definitely sympathize! It can be very frustrating when you can't get fosters to respond and keep you updated. There are two things that I found generally seem to help, particularly for first-time fosters and foster-to-adopt situations.
The first is that I give them a set day that I am going to call/e-mail, and a reason why I need to speak with them at that time. For me, that generally is Mondays, because we have a staff meeting Tuesday, and if there is any action we need to take, that is when we will be discussing it. If that won't work for this particular foster, I try to set a mutually agreed day/time for me to reach them. I think having a time and reason helps keep people from putting it off. They can even put it into their own calendar, and I will often write it on a sticky note and put it on their foster paperwork.
The second is letting them tell me what is the best contact method for them on that day, and making sure I have that preference noted if I have multiple types of contact info. Some people only ever seem to respond to text messages, others need a phone call so we can talk directly, and sometimes people who live nearby actually want to stop by the shelter. If someone doesn't respond to 2-3 attempts to reach them at their preferred contact point, then I try the others.
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