How to prevent connecting to neighbors network extender?

In certain rooms of my house, my HTC One m8 will automatically connect to someone's network extender in the area. The extender it picks up has a horrific signal, and also drops calls if I leave the certain rooms that pick up the signal. My Verizon signal is perfectly fine when not connected to this extender.

I have no idea which neighbor's it may be.

How do I prevent my phone from randomly connecting to this extender automatically?

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