HiFi Sound Connection Did not provide customer service as promised. Riped me off. Internet

I telephone ordered a replacement radio for my van.  they sent the wrong radio.  After dozens of phone calls, they told me to fill out a form they were sending.  The form wasn't sent until dozens of email requests were sent.  Finally I got a RA# number, and returned the radio for the return.  they said that it was too long of a time and so all they could do was replace the radio.  I received another incorrect radio.  I emailed and phoned to find out what I should do about the problem.  They returned an email that It was too late.  I am still within the 30 day limit for the RA# I received.  I cannot get a response from them by phone.  They have been the cause of the trouble, and refuse to help with the "2 hour" promised phone call return time.