If you have sincerely repented and and feel regretful then yes your prayers are accepted. You don’t have to do qadha of the prayers in any case. Acceptance here means being rewarded for them. One who drinks alcohol, his prayers later are valid but he may not get any reward for them (unless he repents of course).
Also, you should politely rebuke them. Tell them you know I don’t drink alcohol so what gave you the right to give me such a drink. Let them know that what they did is serious and unacceptable.