I recently canceled my service after several years, as it wasn't worth the expense. I called Clark and gave my credit card to pay the final bill. Their finance people didn't process it properly, and even though I called back repeated (even giving the card again, and waiting on the line to ensure it was processed correctly) and offered to pay by check, they sent the account to a collection agent. When I called the Clark customer service agent who I had previously spoken with, and who knew I had paid the bill repeatedly and on time, he lied to me and said he personally had not done this. However, his manager told me that he was the one who had called the collection agency. And he did this after he knew I was sending in a check (I had given up trying to get the credit card into their system.) Overall, their pest control service was fine, but their office is incompetent and dishonest, and I will never use them again.