Data allowence used in less than 2 days

[MA217]

I have monthly plan with 15GB data allowence. My average data usage is 5.67Gb a month. I am midway through my monthly plan and one day thsi week I noticed I had approx 13.25GB left.. The following day I received a message from O2 stateting I had used 80% of my data. I checked and I had 2.81Gb left.  I could not see any specific reason for this and rarely stream etc. I immediately turned off data raoming and put my phone in Low Data Mode. 

I had to go out next day and needed at one point to turn on Data Roaming to use an app in a store. As i tried to use the app i lost the 2.81Gb left in minutes maybe seconds. Any ideas.  I am now down to zero with 14 days left before renewal. 

I can use wifi fine with no issues. When i looked at what apps have been using data i can see no issues. Concerned that the same will happen next month. 

[MI5]

@MA217 

This is a customer to customer community, not O2, so we cannot access your account, sorry.

You need to contact O2.

Message them on Social Media. Facebook (https://o2uk.co/O2CFB) , Twitter (X)  (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) or give them a call on 202 or 0344 809 0202 (contract) 4445 or 0344 8090222 (PAYG)