Call Block Memory Full - Panasonic Cordless KX-TGDA51

I receive several Robo calls weekly and I block all of them as they come in. Now my new Panasonic phone says when I block a call " Call Block Memory Full, and then it says Blocked number saved.

So, first I am not sure if the number is blocked?  As it is very strange that is says the number is saved. 

I can see that I can Erase Blocked numbers.  However, that does not make sense, as it will allow that robo caller to call me again.

What is the solution to this issue.  I do not have any messages and I am not using memory in any other way except to block robo calls.

Please advise. 
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