Very Bad Service

I am experincing a very bad service with HomChoice, I made two orders in April and one had incorrect Item, i rejected both orders upon delivery as i was not sure which order had incorrect item between the two boxes .Icalled HomeChoice and send emails so many times explaining this and the consultants they said they will follow up with the courier but till today i am still receiving calls and messages from HomeChoice to pay for those orders which i did not take.I really dont know what to do now as this is going to have a negative impact on my credit profile. If There's anyone who can assist me with this matter , i would really appreciate it.