HUCA tips:
1) To avoid being told "You already called about this and were told no". The trick is to call about other things in the middle, so when the rep looks at the notes of the last few calls it's other stuff.
2) To avoid speaking to the same rep you just spoke to. The trick is to use 2 phones, so when the tzaddik answers, you quickly call on the other line and ensure you get a different one.