all makes parts plus they failed to deliver a part that i bought from them and they will not refund my money back fontana, California

ok i bought this part for my car they asked me to pay in cash because they will not accept debit or credit card so did pay in cash and they order the part for me they were supposed  to have it in one week but they did not and after one month they decided to issue a refund check for me they told me i will receive it in the mail so i waited two weeks after no receive my money i went back to them and they told me they had wrong address wich was obviously a lie because the address was on the receipt and on the refund slip they gave me  so weeks passed i will call them almost every day they will give any excuse i deal whit this guys for four months i never got my money back