How can I delete or clear transaction history on myMTNapp?

Is call history retrieval possible when it's deleted from phone mistakenly.

My call history on the last 48 hour. I call number was deleted

Mymtnapp welcome data bonus

Pls i need ur help,I made a transaction of #9000 from my firstbank account too my opay account today in the afternoon but up till now the money as not really on my Opay account...