VODACOM REFUSED TO INCREASE MY PORTFOLIO

I recently wanted to pre order the s22 ultra so asked for a portfolio increase. I'm an extremely good payer! I sent in my revelent documents. My back slips show monies coming into the account on the 15th and end of the month. I get roughly 8k per month. Sometimes more. I do not pay for rent etc. I have ONE ACCOUNT. I generally just buy food stuff etc for me and the rest is for me to spend however. I explained this in my email aswell. They basically imp**** I cannot afford it. Yet I'm buying almost 2k in airtime most months! For topping up in game and for data. Tell me WHAT BULL**** IS THAT??? I buy more damn airtime per month that the cost of the installment but I'm hold it can't be increased???