Put one actual renewal on paper before comparing two reseller pack prices. Write the invoice currency, full cost, balance added and the credits deducted for that renewal. Include any rule for an additional connection. If one provider deducts 12 credits for an annual term and another deducts one, the unit costs describe different things. The useful number is the amount consumed by the same customer term.
If a renewal timed out, check the expiry and ledger before trying a second submission. Keep the reference, time, balance and resulting expiry. Ask whether the supplier can trace the first attempt. Include any confirmed reversal or adjustment in your own ledger.
A good forum question includes the two published debit schedules or links to their public terms. Leave customer access and payment details out of the thread.