Terrible service to get till slip

I am struggling to get any assistance from Game Stores in Gateway. I requested a lost till slip on 6 November 2019. Was told that it would take 4 weeks to get. 4 weeks later on 8 December 2019, went back to returns and was met with very confused staff. On a s**** book our details was eventually found, one of the ladies went to see the manager who eventually comes back to say that no purchase was made on the requested day, yet I have proof of an SMS from Game on the day the purchase was done. So.who isnt doing there job properly. We were not contacted after 4 weeks with any feedback. Impossible to get through to the customer care number. The service is terrible.