Transworld Systems , Inc. XXXX XXXX XXXX, XXXX, PA XXXX has XXXX mailed me collection notices for a bill I paid directly to XXXX XXXX XXXX. I paid {$610.00} on XXXX/XX/XX/2013/15 check # XXXX. It cleared my bank. I have copy of cleared check. I responded to the first notice with a written note back stating that the debt was paid to XXXX XXXX XXXX. I enclosed front and back copy from my bank of cancelled check. The XXXX notice was received yesterday in my mailbox XXXX/XXXX/15. Today I mailed back another response and same photocopy of cancelled check. This is harassment. They could / should have contacted the original debtor.