If you are handy with tools, or know someone who is, you coline the uld try fastening a piece of chicken wire to your side of the fence covering the hole and bury the wire so that when they dig, they just run into wire - they can't dig through that.
You could line your side of the fence with rocks. Plant a few rose bushes or even berry bushes with large thorns. If none of this is possible or desirable, then call your city hall and find out if you have any options. After you know your legal options, talk to your neighbor again, ask them to correct the problem, and tell them what you plan to do if they don't take action.
Not the dogs fault. Their owners are off somehow. Wondering, are the dogs well fed? Perhaps they are hungry. Doesn't sound like the pups are angry, just needing some attention. What if they are trying to choose you as their owner because things at their home are not great?
Have you tried talking to them and making friends? Perhaps they just want to love on you. Puppy love is the greatest. You did know they would protect you should you need it. Best insurance policy available.
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