bad service

My sister has been receiving these SMS Tsholofelo Catherine Raboroko urgently contact GLA regarding your AFRICAN BANK acc to prevent possible legal action on ***. *** I contacted them last week asked them to call me back the consultant I spoke never bothered to take my numbers till today I'm still waiting for a call back instead they busy harassing my sister . That's my name on that SMS why is my sister receiving those SMS instead of me . Please ubdated your systems