You can always send your cheques through registered mail WITH signature. When Minto was being a pain and not returning my letters and such because I was trying to move out, that's what I did: registered mail at headquarters ... putting in the letter that a cc was going to the OHT. Got a phonecall the same day. Sure it costs quite a bit but it sends the message "I mean business and you can't ignore me anymore" quite clearly.
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From:
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