Phone call harassment of the wrong customer's number

My husband has been harassed by Rochester Furniture trying to deliver a desk to a Mr Lamberty and have called us no less that 10 times (more if you include the missed calls). they are in CPT and we are in JNB. we have asked them to deliver it to us as we are sick of receiving their calls which they said they won't which is strange they would keep calling the wrong number to get a different answer! we have done the obvious, asked for our number to be removed but to no avail.