Complete lack of feedback from UberEats

My wife's cellphone was ****** on Sat afternoon 20.10.18. We blocked and blacklisted it at 16h45. At 18h10 I received an SMS notifying me of an UberEats charge on my credit card. We have never downloaded the UberEats App, and we have not registered with them. We could not find a tel no for UberEats so we e-mailed them asking them to block the account. (They rep**** the following morning Sun 21.10.18 . ) During the next 60 mins 6 more charges were made against my credit card at 6 different eateries totalling R11 000,00 all delivered to the same location. We do not understand why their systems did not detect something clearly unusual, and refer it to their customer. For a new customer to be buying this amount of food from 6 different locations in less than an hour, delivered to a location is that is not the registered home address on the Uber taxi app. All this was laid out in an e-mail to UberEats on 25.10.18. No response was received. We e-mailed them again on 31.10.18, asking for a response and still we have heard nothing from them.