No annuity payment received from Momentum

I receive an annual income from a Momentum annuity normally on the 28th June each year. This year no payment arrived in my bank account. I emailed Momentum on the email address on their website. No response. I called Momentum 3 times on the 29th June and was eventually assured that there had been a glitch in the payment system and I would receive my money on the evening of 29th June. No payment has yet been received. No communication from Momentum. This is unacceptable to me and other investors. I rely on this income each year. Very disappointment that I have received no communication from Momentum