The rudeness, arrogance, disrespect,, unprofessional inappropriate conduct of the south African call centre staff. Sainsburys procedure regarding substitions, I have discovered that due to an item which was half price at £2.30 for nectar card holders,so actual price is £4.60 has been substituted with a more costly item priced at £5.50. I will only receive the different of 90p via an coupon, this being the difference between the original price of the item I chose, £4.60 & £5.50 of the substitions. Therefore, for one item I've paid £2.30 & the more expensive sub £4.60 after 90p coupon i have paid a total of £6.90 instead of £4.60. This is an over charge of £2.30!!! The customer service advisors refused to understand my point!!