Did you ask Mastercard for an update?
They detail:
"If Mastercard determines that the Merchant is accepting Mastercard cards through an existing Acquirer relationship, Mastercard will send the Referral to the Acquirer and require that the Acquirer investigate the alleged illegal activity and, within five business days, provide a written report to Mastercard setting forth the results of the investigation and any steps taken to address those results."
Maybe that your email got misplaced in their ticket follow-up or something.
Send them another one. Give them 1-2 week, then ask them for an update.
It always worked for me.
Here's one of their recent answer to one below:
They detail:
"If Mastercard determines that the Merchant is accepting Mastercard cards through an existing Acquirer relationship, Mastercard will send the Referral to the Acquirer and require that the Acquirer investigate the alleged illegal activity and, within five business days, provide a written report to Mastercard setting forth the results of the investigation and any steps taken to address those results."
Maybe that your email got misplaced in their ticket follow-up or something.
Send them another one. Give them 1-2 week, then ask them for an update.
It always worked for me.
Here's one of their recent answer to one below:

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