No Communication

I ordered some items on the Mr Price Website for Store collection at Mr price Cresta. i received an email stating that my order is ready for collection. i went to the store to collect the sealed parcel and went home. to my surprise when i opened the parcel at home, some of the items were not there. so i contacted the Mr Price help line ********** 535 and got through to a lady that then told me that oh those items are not in stock and that is why i havent received them. that was the first time i heard of it as there was no communication in any way to tell me that the items were not in stock. so if i had not called to find out it means Mr price would have not siad anything yet i paid for those items. she then told me a voucher has been issued for me to go to shop at any mr price which means i have to go to the store again. i then agreed because i was told the voucher would be ready in 24hrs. i did not receive the voucher in 24hrs so i contacted their customer service again, i spoke to a nice lady called Samantha and she explained that yes there is a voucher for me but their system how ever has not processed a reference number as yet so unfortunately i have to wait for the system. this is not on. i have been buying from Mr Price for many years and ive never had any issues until now.