Overcharged

I had bought goods online, for R1389, on the 23rd March transaction went through all was well, they delivered the good, as 2 batches as some of the stock was not packed, OK fine they called and informed me on the 27 March when they debited so they say, they took Another R1500,71 which now they say they dd because they had substituted with some stuff that i ordered was not available, not even a phone call to inform me of this change and the amount rise, so i call this morning they reversed the R1389, but now my account on a minus R111.53 that they had increased with the substitutes that i didn't authorize on the raise on my account, this is a pathetic service they only inform me on email about this and now im suppose to be fine, i expect netter from woolies, this is a matter that should be address we trust them with our cards and they do as they please so that account doesn't always have money so they over transacted that so who is liable for that as no one informed ,me on the products i ordered are out of stock and they substituting

VERY BAD SERVICE I GOT NO MORE