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Some other advice, check that your preferred sim is assigned to Messages, Settings-Connections-Sim card Manager. check that Text is set as Default if that is preferred option, Settings - Chat Settings -Select Default Messaging Type, and set this to 'Text or Multimedia Messages'. If you go to Messages- Menu(3 dots)-Settings-More Settings-Text Messages check that a number is poulated in the Message Centre Section.
otherwise restart phone and check for any updates. you may need to clear the Messages cache,Settings-Apps-Messages-Storage-clear cache. You may though needs to check with Tesco.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
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To remove the voicemail notification, try: Settings, Apps, show system apps, Phone Services app, then clear data. (This is not the same as the Phone app).
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Hopefully it's all sorted for you now then.