AN A320 WAS REMOVED FROM SVC DUE TO UNABLE TO SECURE DOOR EMER SLIDE COVERS. DOOR SLIDE PACKED IMPROPERLY AND NOT TIGHT.

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ACR X HAS A VENDOR WHO PACKS AND SUPPLIES EMER DOOR SLIDES. WE HAVE BEEN RECEIVING SLIDES THAT ARE NOT PACKED TIGHTLY. IF NOT PACKED CORRECTLY; THE COVERS WILL NOT STAY ON. I HAD THIS PROB WITH ACFT X. CREW WROTE UP DOOR 2R DOOR SLIDE COVER FALLING OFF. I NOTICED I COULD SECURE THE TOP AND BOTTOM BUT THE CLIPS ON THE SIDE WOULD NOT ENGAGE. I COMPARED SLIDES WITH DOOR 2L. THIS COVER ALSO WAS NOT ENGAGED. BOTH SLIDE PACKS WERE PACKED INCORRECTLY. I CALLED MAINT CTLR. HE SAID IT WAS A NO-GO. ACFT WENT TO HANGAR AND FLT CANCELED. NEXT DAY; I CHKED ACFT X'S HISTORY. COVER SECURED AND WAS FLYING. THE PACKS WERE NOT REPLACED! THE ACFT WAS FLYING TO ZZZ1. I CALLED MAINT CTLR AND TALKED TO MR X. I ASKED HIM TO MAKE A CALLOUT TO CHANGE SLIDES. HE DID. NEXT DAY; I CAME IN AND WAS TOLD WE HAD AN AIRBUS COMING IN WITH 2 SLIDE PACK CHANGES COMING IN FROM ZZZ2 (ACFT X). THIS ACFT WAS STILL FLYING REVENUE PAX; ILLEGALLY! ACR X ONLY HAD 3 SLIDE PACKS IN THE SYS. I BELIEVE THEY KNOWINGLY FLY THESE ACFT UNTIL THE CONVENIENCE TO FIX THEM. ALSO; THE VENDOR'S POOR ABILITY TO PACK SLIDES!