I'm sure you won't have any further issues @Tsidkenu1es
Most likely an account glitch and I hope all is good now 
@Cleoriff When I got transferred from TalkTalk, my new contract with O2 was with a new temporary SIM and new number, myO2 contact details was with TT SIM's number, I think the glitch was there... and now that my old number from TT is with O2, I have no problems since... also the problem could be the signing in and logging out of the 2 accounts I have with O2 (My wife's and mine) from the same PC, the PC Server may get confuse... may be? 
More likely to be a sign in and password issue but yes, as long as you sign out correctly there should be no issues using two accounts on one pc.
@Tsidkenu1es wrote:...Hope so...! @jonsie
@Tsidkenu1es wrote:@Cleoriff When I got transferred from TalkTalk, my new contract with O2 was with a new temporary SIM and new number, myO2 contact details was with TT SIM's number, I think the glitch was there... and now that my old number from TT is with O2, I have no problems since... also the problem could be the signing in and logging out of the 2 accounts I have with O2 (My wife's and mine) from the same PC, the PC Server may get confuse... may be?
Ah I see....that would explain it then. Thanks @Tsidkenu1es 
