EXPIRED MEDICATION

I bought Vitamin C tablets from Clicks Pharmacy Elspark on Sunday. My 10 years old son and I have been taking them only to find that they have expired. I'm pregnant and this is a risk for me and my unborn child. How can they be careless, what if this affects us and even my unborn child. I do not want to hear any apology, something has to be done. I will not let these go, I'm going to take it further.