pathetic management , ********* behavior and no customer service abilities

good day I am writing this on behalf of my parents 1stly who don't have access to this site. on the 1st of may 2018(last Tuesday) they went to pnp at the phoenix plaza and once again was treated very poorly by staff there. all pnps had the stork for R29.99 and my dad had a further R5.90 discount which means his total was sup to be R24.09 and yet was been charged R39.99 when they questioned this after a 10/15min 'explanation' from the supervisor a R4 discount was given , my dad then re-explained 29.99-5.90=24.09 and was still been charged R36, at that point any customer will get frustrated as the stork was even been advertised on TV for R29.99, then once again Logan WHO CLAIMS TO BE THE STORE MANAGER AND DIRECTOR asks my dad what's your problem roughly , says he will throw my dad out of the store and says they can go tell whoever he isn't scared , customers clearly cannot talk about their rights at that branch he then wants to throw them out and the security has to tell him to keep quiet ??? now I tried calling the branch number ********** 633 no one answers , who is the manager of that store , this is the 2nd incident at that branch and I will not take it lightly of elderly people been treated in such a manner will you want someone to treat your parents like dirt ??? this infuriates me and this is the 2nd incident with that guy logan!!!!!!!!! either the management needs to change there or i will take this up further.