Incorrect medication

I am a regular customer of pelican pharmacy and contacted them yesterday for some OTC medication as my son had a high fever and GP'S were closed,I asked for ponstan suppositories,Walpole and mood ointment, the person in charge in dispensary suggested I take panamor which is better than ponstan,when medication was delivered and I googled as it's first time use I saw its not for fever and is a generic for voltaren,this morning I contacted them and they are being extremely rude and a manager refuses to contact me even though the fault is on their side, absolutely disgusted by the service as my son could have had a bad reaction as I am allergic to voltaren.I have called and emailed with no response till now.