Unhappy

I bought a wearable device from dischem on 25/09/15. I did not have savings available so I paid for the item . When I got home I discovered a piece was missing. I took it back and they did the replacement for me in the front office, not through the pharmacy. A couple of weeks later I saw that they submitted another claim and I phoned them regarding this. The lady said she would reverse. I did not see that she reversed the original transaction as well. In the second week of Jan. I received a letter stating I owe discovery money. I contact dischem and they said discovery wont allow them to put through the claim for last year. So in effect I am paying for the device twice. Also on 8 october I went to collect my son and my repeat prescription. Part was chronic and part I payed as there was no funds in my savings. The next day I went to the Dr and he changed the chronic meds. THe pharmacy said I could return the meds but I paid for the new chronic out of my pocket. They reversed the transaction and resubmitted. That also caused me to owe discovery money. I am trying to be honest and Discovery penalises me. I did not get any new meds.I complained already but all I got was a recon of my a