Cervical length

Just wondering if anyone has been in a similar situation or can offer any advice... I had an 11mm cervical biopsy in 2019. I then feel pregnant with my daughter in 2021 when the threshold for receiving additional scans to monitor cervix length was 10mm or more. Unfortunately I wasn't listened to by my midwife so didn't receive any of the additional checks I was entitled to and had to receive a formal apology from the hospital. Fast forward to now and I'm 19 weeks pregnant. The threshold has increased to 15mm so I no longer qualify for additional scans, however I have mentioned over and over that with my daughter my waters were leaking from around 34 weeks. I was really naive at the time and didn't get it checked out, thank god nothing happened and my daughter arrived safely at 37 weeks when my waters fully went and I had to be induced as labour didn't start naturally. I'm convinced my waters were leaking because of my weakened cervix. I brought this up again at my 16 week midwife appointment and she said she'd make a referral and see if the hospital would be willing to see me even though I don't meet the threshold, but I've heard nothing since. I ring the hospital and they say I need to speak to my midwife - I ring my midwife and they don't pick up and don't return my calls. I feel like I'm not being listened to again and it's so frustrating and disheartening. I think I'm going to be left with no choice but to pay privately for cervical length scans, but at £95 a time it's going to leave a big dent in my maternity savings.