I sold a business and on the security agreement the buyer owed me money to be paid in 4 monthly installments. He paid the first payment but stopped claiming I sold him a loosing business of which he researched for two months before buying. I was also awaiting some checks from customers after escrow closed of which he received. When asked he told me he received nothing. I called the accounting department for the customer not the purchasing agent, to get the status on the check since it was already 2 months overdue and was told the checks were received and cashed already by the buyer. He is now claiming I broke the contract by contacting the customer and does not want to pay me the money he owes. I only contacted accounting department and never had discussions about business and he never informed me that he received my checks. Did I breach the contract or is he breaching the contract by not making payments? I am trying to hire an attorney as well any suggestions in the Los Angeles area or what can I do to minimize my expenses.