Service sucks

I purchased a sweater and hoodie online using my TFG account. There was a sale whilst I bought the items two months ago. The delivery was quick. i got my package within 24 hours. But I sat down and looked at my invoice. The amounts I was charged was without the sale discount that was advertised on the their website. I called the TFG online query hotline and one of the agents logged it. I had to follow up with them every time. The contact center doesn't have the answers as they sent an email to the TS head office to query this. I am still awaiting for someone to call me back to tell me what happened with my purchase. Can someone from the TS head office call me back to solve this? I am so annoyed as I waste my time and airtime calling the contact center and given empty promises all the time. Your TAT is 48 hours but 2 months????? This is actually ridiculous.