Charged twice for 1 item

I shopped at PnP Express Oreilly Merry on 5th January 2021.

Besides a few other items, i purchased a half dozen hot dog rolls and 500g chicken cheese viennas (1 packet) Mashudu BR Masotshwa help me. As with other people, i do not scrutinise my till slip whilst standing at the till and also because of other people waiting in line. Every 2 weeks i check my slips. I found that she had scanned the viennas TWICE!!! I did not buy 2 packs of viennas. Why would i buy 2 but only half dozen rolls???? This is disgusting to say the least. How many customers do you people ***** from like this? But i bet PnP will tell me, i should have checked my slip when i bought the goods. If Pnp dont fix this for me, i will no longer shop at this outlet and i will go to facebook to warn other people of what your staff do.