That is neither a fact nor an opinion, it is an error. No one can prevent you from buying shares of RCCH. Your specific broker might not want to assist you in your effort but that is because he doesn't want to be involved in what is clearly a crooked stock. If you want to buy shares of RCCH no one can prevent you from doing so.
Kudos to your broker. He is apparently willing to assist you to rid yourself of those same crooked stock shares. The DTCC lock is a huge red flag to all brokerages, it is no surprise that they wish to avoid any contact with RCCH shares.
That is, as previously pointed out, an erroneous conclusion. The reason your broker won't assist you to buy shares is they don't want to be involved in a scam stock. They don't want to be included in the inevitable litigations that will occur when this pile of @#$% finally crashes.
Again, your broker is more than willing to assist you in escaping from your tainted stock, even if he has to jump through some settlement issues to do so.
Based on the volume figures over the last several months and the intermittent bid, nobody wants to buy your shares.